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Date: Mon, 17 Jun 2013 09:11:45 +0000 (GMT)
From: Holger Kiehl <Holger.Kiehl@....de>
To: "Tantilov, Emil S" <emil.s.tantilov@...el.com>
cc: "e1000-devel@...ts.sf.net" <e1000-devel@...ts.sf.net>,
linux-kernel <linux-kernel@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Problems with ixgbe driver
Hello,
first, thank you for the quick help!
On Fri, 14 Jun 2013, Tantilov, Emil S wrote:
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On
>> Behalf Of Holger Kiehl
>> Sent: Friday, June 14, 2013 4:50 AM
>> To: e1000-devel@...ts.sf.net
>> Cc: linux-kernel; netdev@...r.kernel.org
>> Subject: Problems with ixgbe driver
>>
>> Hello,
>>
>> I have dual port 10Gb Intel network card on a 2 socket (Xeon X5690) with
>> a total of 12 cores. Hyperthreading is enabled so there are 24 cores.
>> The problem I have is that when other systems send large amount of data
>> the network with the intel ixgbe driver gets very slow. Ping times go up
>> from 0.2ms to appr. 60ms. Some FTP connections stall for more then 2
>> minutes. What is strange is that heatbeat is configured on the system
>> with a serial connection to another node and kernel always reports
>
> If the network slows down so much there should be some indication in dmesg. Like Tx hangs perhaps.
> Can you provide the output of dmesg and ethtool -S from the offending interface after the issue occurs?
>
No, there is absolute no indication in dmesg or /var/log/messages. But here
the ethtool output when ping times go up:
root@...ena:~# ethtool -S eth6
NIC statistics:
rx_packets: 4410779
tx_packets: 8902514
rx_bytes: 2014041824
tx_bytes: 13199913202
rx_errors: 0
tx_errors: 0
rx_dropped: 0
tx_dropped: 0
multicast: 4245
collisions: 0
rx_over_errors: 0
rx_crc_errors: 0
rx_frame_errors: 0
rx_fifo_errors: 0
rx_missed_errors: 28143
tx_aborted_errors: 0
tx_carrier_errors: 0
tx_fifo_errors: 0
tx_heartbeat_errors: 0
rx_pkts_nic: 2401276937
tx_pkts_nic: 3868619482
rx_bytes_nic: 868282794731
tx_bytes_nic: 5743382228649
lsc_int: 4
tx_busy: 0
non_eop_descs: 743957
broadcast: 1745556
rx_no_buffer_count: 0
tx_timeout_count: 0
tx_restart_queue: 425
rx_long_length_errors: 0
rx_short_length_errors: 0
tx_flow_control_xon: 171
rx_flow_control_xon: 0
tx_flow_control_xoff: 277
rx_flow_control_xoff: 0
rx_csum_offload_errors: 0
alloc_rx_page_failed: 0
alloc_rx_buff_failed: 0
lro_aggregated: 0
lro_flushed: 0
rx_no_dma_resources: 0
hw_rsc_aggregated: 1153374
hw_rsc_flushed: 129169
fdir_match: 2424508153
fdir_miss: 1706029
fdir_overflow: 33
os2bmc_rx_by_bmc: 0
os2bmc_tx_by_bmc: 0
os2bmc_tx_by_host: 0
os2bmc_rx_by_host: 0
tx_queue_0_packets: 470182
tx_queue_0_bytes: 690123121
tx_queue_1_packets: 797784
tx_queue_1_bytes: 1203968369
tx_queue_2_packets: 648692
tx_queue_2_bytes: 950171718
tx_queue_3_packets: 647434
tx_queue_3_bytes: 948647518
tx_queue_4_packets: 263216
tx_queue_4_bytes: 394806409
tx_queue_5_packets: 426786
tx_queue_5_bytes: 629387628
tx_queue_6_packets: 253708
tx_queue_6_bytes: 371774276
tx_queue_7_packets: 544634
tx_queue_7_bytes: 812223169
tx_queue_8_packets: 279056
tx_queue_8_bytes: 407792510
tx_queue_9_packets: 735792
tx_queue_9_bytes: 1092693961
tx_queue_10_packets: 393576
tx_queue_10_bytes: 583283986
tx_queue_11_packets: 712565
tx_queue_11_bytes: 1037740789
tx_queue_12_packets: 264445
tx_queue_12_bytes: 386010613
tx_queue_13_packets: 246828
tx_queue_13_bytes: 370387352
tx_queue_14_packets: 191789
tx_queue_14_bytes: 281160607
tx_queue_15_packets: 384581
tx_queue_15_bytes: 579890782
tx_queue_16_packets: 175119
tx_queue_16_bytes: 261312970
tx_queue_17_packets: 151219
tx_queue_17_bytes: 220259675
tx_queue_18_packets: 467746
tx_queue_18_bytes: 707472612
tx_queue_19_packets: 30642
tx_queue_19_bytes: 44896997
tx_queue_20_packets: 157957
tx_queue_20_bytes: 238772784
tx_queue_21_packets: 287819
tx_queue_21_bytes: 434965075
tx_queue_22_packets: 269298
tx_queue_22_bytes: 407637986
tx_queue_23_packets: 102344
tx_queue_23_bytes: 145542751
rx_queue_0_packets: 219438
rx_queue_0_bytes: 273936020
rx_queue_1_packets: 398269
rx_queue_1_bytes: 52080243
rx_queue_2_packets: 285870
rx_queue_2_bytes: 102299543
rx_queue_3_packets: 347238
rx_queue_3_bytes: 145830086
rx_queue_4_packets: 118448
rx_queue_4_bytes: 17515218
rx_queue_5_packets: 228029
rx_queue_5_bytes: 114142681
rx_queue_6_packets: 94285
rx_queue_6_bytes: 107618165
rx_queue_7_packets: 289615
rx_queue_7_bytes: 168428647
rx_queue_8_packets: 109288
rx_queue_8_bytes: 35178080
rx_queue_9_packets: 393061
rx_queue_9_bytes: 377122152
rx_queue_10_packets: 155004
rx_queue_10_bytes: 66560302
rx_queue_11_packets: 381580
rx_queue_11_bytes: 182550920
rx_queue_12_packets: 140681
rx_queue_12_bytes: 44514373
rx_queue_13_packets: 127091
rx_queue_13_bytes: 18524907
rx_queue_14_packets: 92548
rx_queue_14_bytes: 34725166
rx_queue_15_packets: 199612
rx_queue_15_bytes: 66689821
rx_queue_16_packets: 90018
rx_queue_16_bytes: 29206483
rx_queue_17_packets: 81277
rx_queue_17_bytes: 55206035
rx_queue_18_packets: 224446
rx_queue_18_bytes: 14869858
rx_queue_19_packets: 16975
rx_queue_19_bytes: 48400959
rx_queue_20_packets: 80806
rx_queue_20_bytes: 5398100
rx_queue_21_packets: 146815
rx_queue_21_bytes: 9796087
rx_queue_22_packets: 136018
rx_queue_22_bytes: 9023369
rx_queue_23_packets: 54781
rx_queue_23_bytes: 34724433
This was with the 3.15.1 driver and setting the combinde queue to 24 via
ethtool, as you suggested below.
>>
>> ttyS0: 4 input overrun(s)
>>
>> when lot of data is send and the ping time goes up.
>>
>> On the network there are three vlan's configured. The network is bonded
>> (active-backup) together with another HP NC523SFP 10Gb 2-port Server
>> Adapter. When I switch the network to this card the problem goes away.
>> Also the ttyS0 input overruns disappear. Note also both network cards
>> are connected to the same switch.
>>
>> The system uses Scientific Linux 6.4 with kernel.org kernel. I noticed
>> this behavior with kernel 3.9.5 and 3.9.6-rc1. Before I did not notice
>> it because traffic always went over the HP NC523SFP qlcnic card.
>>
>> In search for a solution to the problem I found a newer ixgbe driver
>> 3.15.1 (3.9.6-rc1. has 3.11.33-k) and tried that. But it has the same
>> problem. However when I load the module as follows:
>>
>> modprobe ixgbe RSS=8,8
>>
>> the problem goes away. The kernel.org ixgbe driver does not offer this
>> option. Why? It seems that both drivers have problems on systems with
>
> If you are using newer kernel and ethtool version you can use `ethtool -L ethX combined Y` to control the number of queues per interface.
>
Okay, thank you! I did not know this.
>> 24 cpu's. But I cannot believe that I am the only one who noticed this,
>> since ixgbe is widely used.
>
> We run traffic with multiple queues all the time and I don't think what you are reporting is a generic issue. Most likely it's something related to your setup/system.
>
Yes, I think so too. But what could it be? Please, just ask what other
information I could provide. As I already mentioned earlier the ixgbe card
is bonded with a qlogic nic and I have two (not three) vlan configured over
over this bond. Maybe the following is useful (eth6 is the ixgbe driver):
root@...ena:~# ethtool -k eth6
Features for eth6:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: on
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: on
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: on [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
>>
>> It would really be nice if one could set the RSS=8,8 option for kernel.org
>> ixgbe driver too. Or if someone could tell me where I can force the driver
>> to Receive Side Scaling to 8 even if it means editing the source code.
>>
>> Below I have added some additional information. Please CC me since I
>> am not subscribed to any of these lists. And please do not hesitate
>> to ask if more information is needed.
>
> I would suggest that you open up a bug at e1000.sf.net - describe your configuration and attach the relevant info (dmesg, ethtool -S, lspci etc). This would make it easier for us to follow.
>
Sorry, but I could not find out how I can open a new bug. I could just view
existing bugs. Please give me a hint what I need to do.
Thanks,
Holger
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