| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <3d59ff3b-246b-2f46-2351-31c2d58ca6fe@itcare.pl>
Date: Tue, 15 Aug 2017 12:05:37 +0200
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: Linux Kernel Network Developers <netdev@...r.kernel.org>,
Alexander Duyck <alexander.duyck@...il.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Tariq Toukan <tariqt@...lanox.com>
Subject: Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding
performance vs Core/RSS number / HT on
W dniu 2017-08-15 o 12:02, Paweł Staszewski pisze:
>
>
> W dniu 2017-08-15 o 11:57, Jesper Dangaard Brouer pisze:
>> On Tue, 15 Aug 2017 11:30:43 +0200 Paweł Staszewski
>> <pstaszewski@...are.pl> wrote:
>>
>>> W dniu 2017-08-15 o 11:23, Jesper Dangaard Brouer pisze:
>>>> On Tue, 15 Aug 2017 02:38:56 +0200
>>>> Paweł Staszewski <pstaszewski@...are.pl> wrote:
>>>>> W dniu 2017-08-14 o 18:19, Jesper Dangaard Brouer pisze:
>>>>>> On Sun, 13 Aug 2017 18:58:58 +0200 Paweł Staszewski
>>>>>> <pstaszewski@...are.pl> wrote:
>>>>>>> To show some difference below comparision vlan/no-vlan traffic
>>>>>>>
>>>>>>> 10Mpps forwarded traffic vith no-vlan vs 6.9Mpps with vlan
>>>>>> I'm trying to reproduce in my testlab (with ixgbe). I do see, a
>>>>>> performance reduction of about 10-19% when I forward out a VLAN
>>>>>> interface. This is larger than I expected, but still lower than
>>>>>> what
>>>>>> you reported 30-40% slowdown.
>>>>>>
>>>>>> [...]
>>>>> Ok mellanox afrrived (MT27700 - mlnx5 driver)
>>>>> And to compare melannox with vlans and without: 33% performance
>>>>> degradation (less than with ixgbe where i reach ~40% with same
>>>>> settings)
>>>>>
>>>>> Mellanox without TX traffix on vlan:
>>>>> ID;CPU_CORES / RSS QUEUES;PKT_SIZE;PPS_RX;BPS_RX;PPS_TX;BPS_TX
>>>>> 0;16;64;11089305;709715520;8871553;567779392
>>>>> 1;16;64;11096292;710162688;11095566;710116224
>>>>> 2;16;64;11095770;710129280;11096799;710195136
>>>>> 3;16;64;11097199;710220736;11097702;710252928
>>>>> 4;16;64;11080984;567081856;11079662;709098368
>>>>> 5;16;64;11077696;708972544;11077039;708930496
>>>>> 6;16;64;11082991;709311424;8864802;567347328
>>>>> 7;16;64;11089596;709734144;8870927;709789184
>>>>> 8;16;64;11094043;710018752;11095391;710105024
>>>>>
>>>>> Mellanox with TX traffic on vlan:
>>>>> ID;CPU_CORES / RSS QUEUES;PKT_SIZE;PPS_RX;BPS_RX;PPS_TX;BPS_TX
>>>>> 0;16;64;7369914;471674496;7370281;471697980
>>>>> 1;16;64;7368896;471609408;7368043;471554752
>>>>> 2;16;64;7367577;471524864;7367759;471536576
>>>>> 3;16;64;7368744;377305344;7369391;471641024
>>>>> 4;16;64;7366824;471476736;7364330;471237120
>>>>> 5;16;64;7368352;471574528;7367239;471503296
>>>>> 6;16;64;7367459;471517376;7367806;471539584
>>>>> 7;16;64;7367190;471500160;7367988;471551232
>>>>> 8;16;64;7368023;471553472;7368076;471556864
>>>> I wonder if the drivers page recycler is active/working or not, and if
>>>> the situation is different between VLAN vs no-vlan (given
>>>> page_frag_free is so high in you perf top). The Mellanox drivers
>>>> fortunately have a stats counter to tell us this explicitly (which the
>>>> ixgbe driver doesn't).
>>>>
>>>> You can use my ethtool_stats.pl script watch these stats:
>>>> https://github.com/netoptimizer/network-testing/blob/master/bin/ethtool_stats.pl
>>>> (Hint perl dependency: dnf install perl-Time-HiRes)
>>> For RX NIC:
>>> Show adapter(s) (enp175s0f0) statistics (ONLY that changed!)
>>> Ethtool(enp175s0f0) stat: 78380071 ( 78,380,071) <=
>>> rx0_bytes /sec
>>> Ethtool(enp175s0f0) stat: 230978 ( 230,978) <=
>>> rx0_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1152648 ( 1,152,648) <=
>>> rx0_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1152648 ( 1,152,648) <=
>>> rx0_packets /sec
>>> Ethtool(enp175s0f0) stat: 921614 ( 921,614) <=
>>> rx0_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 78956591 ( 78,956,591) <=
>>> rx1_bytes /sec
>>> Ethtool(enp175s0f0) stat: 233343 ( 233,343) <=
>>> rx1_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1161126 ( 1,161,126) <=
>>> rx1_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1161126 ( 1,161,126) <=
>>> rx1_packets /sec
>>> Ethtool(enp175s0f0) stat: 927793 ( 927,793) <=
>>> rx1_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 79677124 ( 79,677,124) <=
>>> rx2_bytes /sec
>>> Ethtool(enp175s0f0) stat: 233735 ( 233,735) <=
>>> rx2_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1171722 ( 1,171,722) <=
>>> rx2_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1171722 ( 1,171,722) <=
>>> rx2_packets /sec
>>> Ethtool(enp175s0f0) stat: 937989 ( 937,989) <=
>>> rx2_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 78392893 ( 78,392,893) <=
>>> rx3_bytes /sec
>>> Ethtool(enp175s0f0) stat: 230311 ( 230,311) <=
>>> rx3_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1152837 ( 1,152,837) <=
>>> rx3_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1152837 ( 1,152,837) <=
>>> rx3_packets /sec
>>> Ethtool(enp175s0f0) stat: 922513 ( 922,513) <=
>>> rx3_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 65165583 ( 65,165,583) <=
>>> rx4_bytes /sec
>>> Ethtool(enp175s0f0) stat: 191969 ( 191,969) <=
>>> rx4_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 958317 ( 958,317) <=
>>> rx4_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 958317 ( 958,317) <=
>>> rx4_packets /sec
>>> Ethtool(enp175s0f0) stat: 766332 ( 766,332) <=
>>> rx4_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 66920721 ( 66,920,721) <=
>>> rx5_bytes /sec
>>> Ethtool(enp175s0f0) stat: 197150 ( 197,150) <=
>>> rx5_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 984128 ( 984,128) <=
>>> rx5_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 984128 ( 984,128) <=
>>> rx5_packets /sec
>>> Ethtool(enp175s0f0) stat: 786978 ( 786,978) <=
>>> rx5_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 79076984 ( 79,076,984) <=
>>> rx6_bytes /sec
>>> Ethtool(enp175s0f0) stat: 233735 ( 233,735) <=
>>> rx6_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1162897 ( 1,162,897) <=
>>> rx6_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1162897 ( 1,162,897) <=
>>> rx6_packets /sec
>>> Ethtool(enp175s0f0) stat: 929163 ( 929,163) <=
>>> rx6_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 78660672 ( 78,660,672) <=
>>> rx7_bytes /sec
>>> Ethtool(enp175s0f0) stat: 230413 ( 230,413) <=
>>> rx7_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 1156775 ( 1,156,775) <=
>>> rx7_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1156775 ( 1,156,775) <=
>>> rx7_packets /sec
>>> Ethtool(enp175s0f0) stat: 926376 ( 926,376) <=
>>> rx7_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 10674565 ( 10,674,565) <=
>>> rx_65_to_127_bytes_phy /sec
>>> Ethtool(enp175s0f0) stat: 605241031 ( 605,241,031) <= rx_bytes
>>> /sec
>>> Ethtool(enp175s0f0) stat: 768585608 ( 768,585,608) <=
>>> rx_bytes_phy /sec
>>> Ethtool(enp175s0f0) stat: 1781569 ( 1,781,569) <=
>>> rx_cache_reuse /sec
>>> Ethtool(enp175s0f0) stat: 8900603 ( 8,900,603) <=
>>> rx_csum_complete /sec
>>> Ethtool(enp175s0f0) stat: 1773785 ( 1,773,785) <=
>>> rx_out_of_buffer /sec
>>> Ethtool(enp175s0f0) stat: 8900603 ( 8,900,603) <=
>>> rx_packets /sec
>>> Ethtool(enp175s0f0) stat: 10674799 ( 10,674,799) <=
>>> rx_packets_phy /sec
>>> Ethtool(enp175s0f0) stat: 7118993 ( 7,118,993) <=
>>> rx_page_reuse /sec
>>> Ethtool(enp175s0f0) stat: 768565744 ( 768,565,744) <=
>>> rx_prio0_bytes /sec
>>> Ethtool(enp175s0f0) stat: 10674522 ( 10,674,522) <=
>>> rx_prio0_packets /sec
>>> Ethtool(enp175s0f0) stat: 725871089 ( 725,871,089) <=
>>> rx_vport_unicast_bytes /sec
>>> Ethtool(enp175s0f0) stat: 10674575 ( 10,674,575) <=
>>> rx_vport_unicast_packets /sec
>>
>> It looks like the mlx5 page recycle mechanism works:
>>
>> 230413 ( 230,413) <= rx7_cache_reuse /sec
>> + 926376 ( 926,376) <= rx7_page_reuse /sec
>> =1156789 (230413+926376)
>> -1156775 ( 1,156,775) <= rx7_packets /sec
>> = 14
>>
>> You can also determine this as there are no counters for:
>> rx_cache_full or
>> rx_cache_empty or
>> rx1_cache_empty
>> rx1_cache_busy
>>
>>> For TX nic with vlan:
>>> Show adapter(s) (enp175s0f1) statistics (ONLY that changed!)
>>> Ethtool(enp175s0f1) stat: 1 ( 1) <=
>>> rx_65_to_127_bytes_phy /sec
>>> Ethtool(enp175s0f1) stat: 71 ( 71) <=
>>> rx_bytes_phy /sec
>>> Ethtool(enp175s0f1) stat: 1 ( 1) <=
>>> rx_multicast_phy /sec
>>> Ethtool(enp175s0f1) stat: 1 ( 1) <=
>>> rx_packets_phy /sec
>>> Ethtool(enp175s0f1) stat: 71 ( 71) <=
>>> rx_prio0_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1 ( 1) <=
>>> rx_prio0_packets /sec
>>> Ethtool(enp175s0f1) stat: 67 ( 67) <=
>>> rx_vport_multicast_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1 ( 1) <=
>>> rx_vport_multicast_packets /sec
>>> Ethtool(enp175s0f1) stat: 64955114 ( 64,955,114) <=
>>> tx0_bytes /sec
>>> Ethtool(enp175s0f1) stat: 955222 ( 955,222) <=
>>> tx0_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 26489 ( 26,489) <= tx0_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 955222 ( 955,222) <=
>>> tx0_packets /sec
>>> Ethtool(enp175s0f1) stat: 66799214 ( 66,799,214) <=
>>> tx1_bytes /sec
>>> Ethtool(enp175s0f1) stat: 982341 ( 982,341) <=
>>> tx1_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 27225 ( 27,225) <= tx1_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 982341 ( 982,341) <=
>>> tx1_packets /sec
>>> Ethtool(enp175s0f1) stat: 78650421 ( 78,650,421) <=
>>> tx2_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1156624 ( 1,156,624) <=
>>> tx2_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 32059 ( 32,059) <= tx2_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1156624 ( 1,156,624) <=
>>> tx2_packets /sec
>>> Ethtool(enp175s0f1) stat: 78186849 ( 78,186,849) <=
>>> tx3_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1149807 ( 1,149,807) <=
>>> tx3_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 31879 ( 31,879) <= tx3_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1149807 ( 1,149,807) <=
>>> tx3_packets /sec
>>> Ethtool(enp175s0f1) stat: 234 ( 234) <=
>>> tx3_xmit_more /sec
>>> Ethtool(enp175s0f1) stat: 78466099 ( 78,466,099) <=
>>> tx4_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1153913 ( 1,153,913) <=
>>> tx4_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 31990 ( 31,990) <= tx4_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1153913 ( 1,153,913) <=
>>> tx4_packets /sec
>>> Ethtool(enp175s0f1) stat: 78765724 ( 78,765,724) <=
>>> tx5_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1158319 ( 1,158,319) <=
>>> tx5_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 32115 ( 32,115) <= tx5_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1158319 ( 1,158,319) <=
>>> tx5_packets /sec
>>> Ethtool(enp175s0f1) stat: 264 ( 264) <=
>>> tx5_xmit_more /sec
>>> Ethtool(enp175s0f1) stat: 79669524 ( 79,669,524) <=
>>> tx6_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1171611 ( 1,171,611) <=
>>> tx6_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 32490 ( 32,490) <= tx6_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1171611 ( 1,171,611) <=
>>> tx6_packets /sec
>>> Ethtool(enp175s0f1) stat: 79389329 ( 79,389,329) <=
>>> tx7_bytes /sec
>>> Ethtool(enp175s0f1) stat: 1167490 ( 1,167,490) <=
>>> tx7_csum_none /sec
>>> Ethtool(enp175s0f1) stat: 32365 ( 32,365) <= tx7_nop
>>> /sec
>>> Ethtool(enp175s0f1) stat: 1167490 ( 1,167,490) <=
>>> tx7_packets /sec
>>> Ethtool(enp175s0f1) stat: 604885175 ( 604,885,175) <= tx_bytes
>>> /sec
>>> Ethtool(enp175s0f1) stat: 676059749 ( 676,059,749) <=
>>> tx_bytes_phy /sec
>>> Ethtool(enp175s0f1) stat: 8895370 ( 8,895,370) <=
>>> tx_packets /sec
>>> Ethtool(enp175s0f1) stat: 8895522 ( 8,895,522) <=
>>> tx_packets_phy /sec
>>> Ethtool(enp175s0f1) stat: 676063067 ( 676,063,067) <=
>>> tx_prio0_bytes /sec
>>> Ethtool(enp175s0f1) stat: 8895566 ( 8,895,566) <=
>>> tx_prio0_packets /sec
>>> Ethtool(enp175s0f1) stat: 640470657 ( 640,470,657) <=
>>> tx_vport_unicast_bytes /sec
>>> Ethtool(enp175s0f1) stat: 8895427 ( 8,895,427) <=
>>> tx_vport_unicast_packets /sec
>>> Ethtool(enp175s0f1) stat: 498 ( 498) <=
>>> tx_xmit_more /sec
>> We are seeing some xmit_more, this is interesting. Have you noticed,
>> if (in the VLAN case) there is a queue in the qdisc layer?
>>
>> Simply inspect with: tc -s qdisc show dev ixgbe2
> for vlan no qdisc:
> tc -s -d qdisc show dev vlan1000
>
> qdisc noqueue 0: root refcnt 2
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
>
> physical interface mq attached with pfifo_fast:
>
> tc -s -d qdisc show dev enp175s0f1
> qdisc mq 0: root
> Sent 1397200697212 bytes 3965888669 pkt (dropped 78065663, overlimits
> 0 requeues 629868)
> backlog 0b 0p requeues 629868
> qdisc pfifo_fast 0: parent :38 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :37 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :36 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :35 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :34 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :33 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :32 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :31 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :30 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2f bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2e bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2d bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2c bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2b bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :2a bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :29 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :28 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :27 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :26 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :25 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :24 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :23 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :22 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :21 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :20 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1f bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1e bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1d bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1c bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1b bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :1a bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :19 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :18 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 176 bytes 2 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :17 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :16 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :15 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :14 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :13 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :12 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :11 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: parent :10 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
> 1 1 1 1 1
> Sent 18534143578 bytes 289595993 pkt (dropped 0, overlimits 0
> requeues 1191)
> backlog 0b 0p requeues 1191
> qdisc pfifo_fast 0: parent :f bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 17022213952 bytes 265972093 pkt (dropped 0, overlimits 0
> requeues 1126)
> backlog 0b 0p requeues 1126
> qdisc pfifo_fast 0: parent :e bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 19610732552 bytes 306417696 pkt (dropped 0, overlimits 0
> requeues 147499)
> backlog 0b 0p requeues 147499
> qdisc pfifo_fast 0: parent :d bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 18153006206 bytes 283640721 pkt (dropped 0, overlimits 0
> requeues 171576)
> backlog 0b 0p requeues 171576
> qdisc pfifo_fast 0: parent :c bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 20642461846 bytes 322538466 pkt (dropped 0, overlimits 0
> requeues 67124)
> backlog 0b 0p requeues 67124
> qdisc pfifo_fast 0: parent :b bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 19343910144 bytes 302248596 pkt (dropped 0, overlimits 0
> requeues 224627)
> backlog 0b 0p requeues 224627
> qdisc pfifo_fast 0: parent :a bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 20735716968 bytes 323995576 pkt (dropped 0, overlimits 0
> requeues 1451)
> backlog 0b 0p requeues 1451
> qdisc pfifo_fast 0: parent :9 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 19371526272 bytes 302680098 pkt (dropped 0, overlimits 0
> requeues 2244)
> backlog 0b 0p requeues 2244
> qdisc pfifo_fast 0: parent :8 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 162202525454 bytes 2444195441 pkt (dropped 31716535, overlimits
> 0 requeues 2456)
> backlog 0b 0p requeues 2456
> qdisc pfifo_fast 0: parent :7 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 163308408548 bytes 2461561759 pkt (dropped 0, overlimits 0
> requeues 1454)
> backlog 0b 0p requeues 1454
> qdisc pfifo_fast 0: parent :6 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 164214830346 bytes 2475734074 pkt (dropped 19272, overlimits 0
> requeues 2216)
> backlog 0b 0p requeues 2216
> qdisc pfifo_fast 0: parent :5 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 160398101830 bytes 2417635038 pkt (dropped 0, overlimits 0
> requeues 1509)
> backlog 0b 0p requeues 1509
> qdisc pfifo_fast 0: parent :4 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 161760263056 bytes 2437965677 pkt (dropped 0, overlimits 0
> requeues 1442)
> backlog 0b 0p requeues 1442
> qdisc pfifo_fast 0: parent :3 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 160300203040 bytes 2415206290 pkt (dropped 0, overlimits 0
> requeues 1615)
> backlog 0b 0p requeues 1615
> qdisc pfifo_fast 0: parent :2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 140144336184 bytes 2114089739 pkt (dropped 0, overlimits 0
> requeues 1177)
> backlog 0b 0p requeues 1177
> qdisc pfifo_fast 0: parent :1 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
> 1 1 1 1
> Sent 131458317060 bytes 1982280594 pkt (dropped 46329856, overlimits
> 0 requeues 1161)
> backlog 0b 0p requeues 1161
>
>
just see that after changing RSS on nics did't deleted qdisc and added
again:
Here situation with qdisc del / add
tc -s -d qdisc show dev enp175s0f1
qdisc mq 1: root
Sent 43738523966 bytes 683414438 pkt (dropped 0, overlimits 0 requeues
1886)
backlog 0b 0p requeues 1886
qdisc pfifo_fast 0: parent 1:10 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2585011904 bytes 40390811 pkt (dropped 0, overlimits 0 requeues 110)
backlog 0b 0p requeues 110
qdisc pfifo_fast 0: parent 1:f bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2602068416 bytes 40657319 pkt (dropped 0, overlimits 0 requeues 121)
backlog 0b 0p requeues 121
qdisc pfifo_fast 0: parent 1:e bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2793524544 bytes 43648821 pkt (dropped 0, overlimits 0 requeues 12)
backlog 0b 0p requeues 12
qdisc pfifo_fast 0: parent 1:d bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2792512768 bytes 43633012 pkt (dropped 0, overlimits 0 requeues 8)
backlog 0b 0p requeues 8
qdisc pfifo_fast 0: parent 1:c bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789822080 bytes 43590970 pkt (dropped 0, overlimits 0 requeues 8)
backlog 0b 0p requeues 8
qdisc pfifo_fast 0: parent 1:b bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789904640 bytes 43592260 pkt (dropped 0, overlimits 0 requeues 9)
backlog 0b 0p requeues 9
qdisc pfifo_fast 0: parent 1:a bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2793279146 bytes 43644987 pkt (dropped 0, overlimits 0 requeues 192)
backlog 0b 0p requeues 192
qdisc pfifo_fast 0: parent 1:9 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789506688 bytes 43586042 pkt (dropped 0, overlimits 0 requeues 171)
backlog 0b 0p requeues 171
qdisc pfifo_fast 0: parent 1:8 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789948928 bytes 43592952 pkt (dropped 0, overlimits 0 requeues 179)
backlog 0b 0p requeues 179
qdisc pfifo_fast 0: parent 1:7 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2790191552 bytes 43596743 pkt (dropped 0, overlimits 0 requeues 177)
backlog 0b 0p requeues 177
qdisc pfifo_fast 0: parent 1:6 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789649280 bytes 43588270 pkt (dropped 0, overlimits 0 requeues 182)
backlog 0b 0p requeues 182
qdisc pfifo_fast 0: parent 1:5 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789654612 bytes 43588354 pkt (dropped 0, overlimits 0 requeues 151)
backlog 0b 0p requeues 151
qdisc pfifo_fast 0: parent 1:4 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2789409280 bytes 43584520 pkt (dropped 0, overlimits 0 requeues 168)
backlog 0b 0p requeues 168
qdisc pfifo_fast 0: parent 1:3 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2792827648 bytes 43637932 pkt (dropped 0, overlimits 0 requeues 165)
backlog 0b 0p requeues 165
qdisc pfifo_fast 0: parent 1:2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2572823936 bytes 40200374 pkt (dropped 0, overlimits 0 requeues 119)
backlog 0b 0p requeues 119
qdisc pfifo_fast 0: parent 1:1 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1
1 1 1 1
Sent 2488427264 bytes 38881676 pkt (dropped 0, overlimits 0 requeues 114)
backlog 0b 0p requeues 114
>
>>
>>
>>>>> ethtool settings for both tests:
>>>>> ifc='enp175s0f0 enp175s0f1'
>>>>> for i in $ifc
>>>>> do
>>>>> ip link set up dev $i
>>>>> ethtool -A $i autoneg off rx off tx off
>>>>> ethtool -G $i rx 128 tx 256
>>>> The ring queue size recommendations, might be different for the mlx5
>>>> driver (Cc'ing Mellanox maintainers).
>>>>
>>>>> ip link set $i txqueuelen 1000
>>>>> ethtool -C $i rx-usecs 25
>>>>> ethtool -L $i combined 16
>>>>> ethtool -K $i gro off tso off gso off sg on
>>>>> l2-fwd-offload off
>>>>> tx-nocache-copy off ntuple on
>>>>> ethtool -N $i rx-flow-hash udp4 sdfn
>>>>> done
>>>> Thanks for being explicit about what you setup is :-)
>>>>> and perf top:
>>>>> PerfTop: 83650 irqs/sec kernel:99.7% exact: 0.0% [4000Hz
>>>>> cycles], (all, 56 CPUs)
>>>>> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>>>>>
>>>>>
>>>>> 14.25% [kernel] [k] dst_release
>>>>> 14.17% [kernel] [k] skb_dst_force
>>>>> 13.41% [kernel] [k] rt_cache_valid
>>>>> 11.47% [kernel] [k] ip_finish_output2
>>>>> 7.01% [kernel] [k] do_raw_spin_lock
>>>>> 5.07% [kernel] [k] page_frag_free
>>>>> 3.47% [mlx5_core] [k] mlx5e_xmit
>>>>> 2.88% [kernel] [k] fib_table_lookup
>>>>> 2.43% [mlx5_core] [k] skb_from_cqe.isra.32
>>>>> 1.97% [kernel] [k] virt_to_head_page
>>>>> 1.81% [mlx5_core] [k] mlx5e_poll_tx_cq
>>>>> 0.93% [kernel] [k] __dev_queue_xmit
>>>>> 0.87% [kernel] [k] __build_skb
>>>>> 0.84% [kernel] [k] ipt_do_table
>>>>> 0.79% [kernel] [k] ip_rcv
>>>>> 0.79% [kernel] [k] acpi_processor_ffh_cstate_enter
>>>>> 0.78% [kernel] [k] netif_skb_features
>>>>> 0.73% [kernel] [k] __netif_receive_skb_core
>>>>> 0.52% [kernel] [k] dev_hard_start_xmit
>>>>> 0.52% [kernel] [k] build_skb
>>>>> 0.51% [kernel] [k] ip_route_input_rcu
>>>>> 0.50% [kernel] [k] skb_unref
>>>>> 0.49% [kernel] [k] ip_forward
>>>>> 0.48% [mlx5_core] [k] mlx5_cqwq_get_cqe
>>>>> 0.44% [kernel] [k] udp_v4_early_demux
>>>>> 0.41% [kernel] [k] napi_consume_skb
>>>>> 0.40% [kernel] [k] __local_bh_enable_ip
>>>>> 0.39% [kernel] [k] ip_rcv_finish
>>>>> 0.39% [kernel] [k] kmem_cache_alloc
>>>>> 0.38% [kernel] [k] sch_direct_xmit
>>>>> 0.33% [kernel] [k] validate_xmit_skb
>>>>> 0.32% [mlx5_core] [k] mlx5e_free_rx_wqe_reuse
>>>>> 0.29% [kernel] [k] netdev_pick_tx
>>>>> 0.28% [mlx5_core] [k] mlx5e_build_rx_skb
>>>>> 0.27% [kernel] [k] deliver_ptype_list_skb
>>>>> 0.26% [kernel] [k] fib_validate_source
>>>>> 0.26% [mlx5_core] [k] mlx5e_napi_poll
>>>>> 0.26% [mlx5_core] [k] mlx5e_handle_rx_cqe
>>>>> 0.26% [mlx5_core] [k] mlx5e_rx_cache_get
>>>>> 0.25% [kernel] [k] eth_header
>>>>> 0.23% [kernel] [k] skb_network_protocol
>>>>> 0.20% [kernel] [k] nf_hook_slow
>>>>> 0.20% [kernel] [k] vlan_passthru_hard_header
>>>>> 0.20% [kernel] [k] vlan_dev_hard_start_xmit
>>>>> 0.19% [kernel] [k] swiotlb_map_page
>>>>> 0.18% [kernel] [k] compound_head
>>>>> 0.18% [kernel] [k] neigh_connected_output
>>>>> 0.18% [mlx5_core] [k] mlx5e_alloc_rx_wqe
>>>>> 0.18% [kernel] [k] ip_output
>>>>> 0.17% [kernel] [k] prefetch_freepointer.isra.70
>>>>> 0.17% [kernel] [k] __slab_free
>>>>> 0.16% [kernel] [k] eth_type_vlan
>>>>> 0.16% [kernel] [k] ip_finish_output
>>>>> 0.15% [kernel] [k] kmem_cache_free_bulk
>>>>> 0.14% [kernel] [k] netif_receive_skb_internal
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> wondering why this:
>>>>> 1.97% [kernel] [k] virt_to_head_page
>>>>> is in top...
>>>> This is related to the page_frag_free() call, but it is weird that it
>>>> shows up because it is suppose to be inlined (it is explicitly marked
>>>> inline in include/linux/mm.h).
>>>>
>>>>>>>>>> perf top:
>>>>>>>>>>
>>>>>>>>>> PerfTop: 77835 irqs/sec kernel:99.7%
>>>>>>>>>> ---------------------------------------------
>>>>>>>>>>
>>>>>>>>>> 16.32% [kernel] [k] skb_dst_force
>>>>>>>>>> 16.30% [kernel] [k] dst_release
>>>>>>>>>> 15.11% [kernel] [k] rt_cache_valid
>>>>>>>>>> 12.62% [kernel] [k] ipv4_mtu
>>>>>>>>> It seems a little strange that these 4 functions are on the top
>>>>>> I don't see these in my test.
>>>>>>>>>> 5.60% [kernel] [k] do_raw_spin_lock
>>>>>>>>> Why is calling/taking this lock? (Use perf call-graph recording).
>>>>>>>> can be hard to paste it here:)
>>>>>>>> attached file
>>>>>> The attached was very big. Please don't attach so big file on
>>>>>> mailing
>>>>>> lists. Next time plase share them via e.g. pastebin. The output
>>>>>> was a
>>>>>> capture from your terminal, which made the output more difficult to
>>>>>> read. Hint: You can/could use perf --stdio and place it in a file
>>>>>> instead.
>>>>>>
>>>>>> The output (extracted below) didn't show who called
>>>>>> 'do_raw_spin_lock',
>>>>>> BUT it showed another interesting thing. The kernel code
>>>>>> __dev_queue_xmit() in might create route dst-cache problem for
>>>>>> itself(?),
>>>>>> as it will first call skb_dst_force() and then skb_dst_drop()
>>>>>> when the
>>>>>> packet is transmitted on a VLAN.
>>>>>>
>>>>>> static int __dev_queue_xmit(struct sk_buff *skb, void
>>>>>> *accel_priv)
>>>>>> {
>>>>>> [...]
>>>>>> /* If device/qdisc don't need skb->dst, release it right now
>>>>>> while
>>>>>> * its hot in this cpu cache.
>>>>>> */
>>>>>> if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
>>>>>> skb_dst_drop(skb);
>>>>>> else
>>>>>> skb_dst_force(skb);
>>>>>>
>>
>
>
Powered by blists - more mailing lists