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Date: Wed, 4 Dec 2013 00:15:00 +0200
From: Or Gerlitz <or.gerlitz@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Miller <davem@...emloft.net>,
Joseph Gasparakis <joseph.gasparakis@...el.com>,
Jerry Chu <hkchu@...gle.com>,
Or Gerlitz <ogerlitz@...lanox.com>,
Eric Dumazet <edumazet@...gle.com>,
Alexei Starovoitov <ast@...mgrid.com>,
Pravin B Shelar <pshelar@...ira.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: vxlan/veth performance issues on net.git + latest kernels
On Tue, Dec 3, 2013 at 11:55 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2013-12-03 at 16:50 -0500, David Miller wrote:
>
>> At this point I would use drop monitor to figure out in what context
>> packets are being dropped on the floor. There are scripts provided
>> with the perf tool to utilize it.
>
> Most easy way is to do :
>
> perf record -e skb:kfree_skb -a -g sleep 10
>
> perf report
The version of perf I have on these nodes fail to run the 1st command,
anyway, here's some data which was asked by Eric
passive side top + plain perf for two streams
top - 00:08:09 up 7:53, 3 users, load average: 0.59, 0.43, 0.32
Tasks: 134 total, 1 running, 133 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 5.7%sy, 0.0%ni, 92.2%id, 0.0%wa, 0.0%hi, 2.0%si, 0.0%st
Cpu1 : 0.6%us, 17.2%sy, 0.0%ni, 30.6%id, 0.0%wa, 0.0%hi, 51.7%si, 0.0%st
Cpu2 : 0.7%us, 4.3%sy, 0.0%ni, 93.6%id, 0.0%wa, 0.0%hi, 1.3%si, 0.0%st
Cpu3 : 0.0%us, 1.7%sy, 0.0%ni, 98.0%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.0%us, 14.4%sy, 0.0%ni, 50.0%id, 0.0%wa, 0.0%hi, 35.6%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 8183220k total, 1383012k used, 6800208k free, 10724k buffers
Swap: 2097148k total, 0k used, 2097148k free, 127520k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3857 root 20 0 381m 640 468 S 69.2 0.0 6:45.22 iperf
15 root 20 0 0 0 0 S 7.3 0.0 0:09.92 ksoftirqd/1
40 root 20 0 0 0 0 S 7.3 0.0 0:12.10 ksoftirqd/6
20 root 20 0 0 0 0 S 0.3 0.0 0:20.95 ksoftirqd/2
9229 root 20 0 220m 16m 6168 S 0.3 0.2 0:00.78 perf
9578 root 20 0 15084 1156 856 R 0.3 0.0 0:00.01 top
1 root 20 0 23648 1644 1320 S 0.0 0.0 0:00.34 init
Samples: 1K of event 'cpu-clock', Event count (approx.): 283500000
5.17% [kernel] [k] fib_table_lookup
5.02% [kernel] [k] __do_softirq
3.63% [kernel] [k] copy_user_generic_unrolled
3.55% perf [.] 0x000000000004c808
3.16% [kernel] [k] __netif_receive_skb_core
3.09% [kernel] [k] _raw_spin_unlock_irqrestore
2.93% [kernel] [k] enqueue_to_backlog
2.85% [kernel] [k] _raw_spin_lock
2.08% [kernel] [k] __pskb_pull_tail
1.93% [kernel] [k] __udp4_lib_lookup
1.85% [kernel] [k] ip_rcv
1.77% [kernel] [k] __slab_free
1.62% [kernel] [k] _raw_spin_unlock_irq
1.54% [kernel] [k] check_leaf
1.47% [kernel] [k] pvclock_clocksource_read
1.47% [kernel] [k] skb_copy_bits
1.31% [kernel] [k] __rcu_read_unlock
1.31% [kernel] [k] tcp_v4_rcv
1.23% [mlx4_en] [k] mlx4_en_process_rx_cq
1.00% [kernel] [k] skb_try_coalesce
1.00% [kernel] [k] napi_gro_frags
1.00% [kernel] [k] __inet_lookup_established
0.93% [mlx4_en] [k] mlx4_en_xmit
ifconfig -a listing (eth2 is the NIC over which we run, br1 is the
bridge) - no recorded drops
[root@...cs47-005 ~]# ifconfig -a
br1 Link encap:Ethernet HWaddr 1A:10:63:AD:55:4C
inet addr:192.168.52.147 Bcast:192.168.52.255 Mask:255.255.255.0
inet6 addr: fe80::f88c:60ff:fe19:6d33/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:32120731 errors:0 dropped:0 overruns:0 frame:0
TX packets:987550 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:46552789260 (43.3 GiB) TX bytes:53462960 (50.9 MiB)
eth0 Link encap:Ethernet HWaddr 00:50:56:25:4A:05
inet addr:10.212.74.5 Bcast:10.212.255.255 Mask:255.255.0.0
inet6 addr: fe80::250:56ff:fe25:4a05/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:265478 errors:0 dropped:16 overruns:0 frame:0
TX packets:14391 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28861836 (27.5 MiB) TX bytes:2561303 (2.4 MiB)
eth2 Link encap:Ethernet HWaddr 00:02:C9:E9:C0:82
inet addr:192.168.30.147 Bcast:192.168.30.255 Mask:255.255.255.0
inet6 addr: fe80::2:c900:1e9:c082/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:853813090 errors:0 dropped:0 overruns:0 frame:0
TX packets:76377493 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1270293325678 (1.1 TiB) TX bytes:7858334980 (7.3 GiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:48 errors:0 dropped:0 overruns:0 frame:0
TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3236 (3.1 KiB) TX bytes:3236 (3.1 KiB)
veth0 Link encap:Ethernet HWaddr EA:4F:C9:1C:5D:EE
inet addr:192.168.62.147 Bcast:192.168.62.255 Mask:255.255.255.0
inet6 addr: fe80::e84f:c9ff:fe1c:5dee/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:372217768 errors:0 dropped:0 overruns:0 frame:0
TX packets:60732630 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:544449586684 (507.0 GiB) TX bytes:3840742148 (3.5 GiB)
veth1 Link encap:Ethernet HWaddr 1A:10:63:AD:55:4C
inet6 addr: fe80::1810:63ff:fead:554c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:60732693 errors:0 dropped:0 overruns:0 frame:0
TX packets:372217836 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3840746210 (3.5 GiB) TX bytes:544449686236 (507.0 GiB)
vxlan42 Link encap:Ethernet HWaddr FE:EF:4E:C7:0F:06
inet addr:192.168.42.147 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::fcef:4eff:fec7:f06/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:404338687 errors:0 dropped:0 overruns:0 frame:0
TX packets:61720259 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:585791638636 (545.5 GiB) TX bytes:4881734478 (4.5 GiB)
active side perf top
Samples: 74K of event 'cpu-clock', Event count (approx.): 12653268255
14.74% [kernel] [k] __copy_user_nocache
7.91% [kernel] [k] csum_partial
7.51% [kernel] [k] _raw_spin_lock
6.38% [kernel] [k] _raw_spin_unlock_irqrestore
5.57% [kernel] [k] __do_softirq
4.24% [mlx4_en] [k] mlx4_en_xmit
2.40% [kernel] [k] __copy_skb_header
2.10% [kernel] [k] _raw_spin_unlock_irq
2.04% [kernel] [k] memcpy
1.92% [kernel] [k] fib_table_lookup
1.73% [kernel] [k] tcp_sendmsg
1.64% [kernel] [k] skb_segment
1.52% [kernel] [k] __slab_free
1.09% [kernel] [k] __alloc_skb
0.89% [kernel] [k] __slab_alloc
0.85% [kernel] [k] tcp_ack
0.83% [kernel] [k] __netif_receive_skb_core
0.81% [kernel] [k] __kmalloc_node_track_caller
0.75% [kernel] [k] ip_send_check
0.70% [kernel] [k] put_compound_page
0.70% [kernel] [k] ksize
0.67% [kernel] [k] pvclock_clocksource_read
0.65% [kernel] [k] dev_hard_start_xmit
0.61% [kernel] [k] kmem_cache_alloc_node
0.58% [kernel] [k] dev_queue_xmit
0.55% [kernel] [k] enqueue_to_backlog
0.52% [kernel] [k] __pskb_pull_tail
0.49% [kernel] [k] __iowrite64_copy
0.45% [kernel] [k] dev_queue_xmit_nit
0.45% [kernel] [k] skb_copy_bits
0.44% [kernel] [k] check_leaf
0.44% [kernel] [k] skb_release_data
0.44% [kernel] [k] get_page_from_freelist
0.43% [kernel] [k] inet_gso_segment
0.42% [mlx4_en] [k] mlx4_en_process_rx_cq
0.39% [kernel] [k] process_backlog
0.38% [kernel] [k] pskb_expand_head
and top
[root@...cs44-005 ~]# top
top - 00:13:27 up 7:59, 3 users, load average: 1.11, 0.76, 0.44
Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 10.3%sy, 0.0%ni, 87.0%id, 0.0%wa, 0.0%hi, 2.7%si, 0.0%st
Cpu1 : 0.3%us, 11.7%sy, 0.0%ni, 84.3%id, 0.0%wa, 0.0%hi, 3.7%si, 0.0%st
Cpu2 : 0.5%us, 18.4%sy, 0.0%ni, 43.4%id, 0.0%wa, 0.0%hi, 37.8%si, 0.0%st
Cpu3 : 0.0%us, 5.1%sy, 0.0%ni, 94.3%id, 0.0%wa, 0.0%hi, 0.7%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 0.3%us, 6.0%sy, 0.0%ni, 93.4%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st
Cpu6 : 0.3%us, 7.4%sy, 0.0%ni, 92.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 24.4%sy, 0.0%ni, 42.1%id, 0.0%wa, 0.0%hi, 33.5%si, 0.0%st
Mem: 8183236k total, 1378928k used, 6804308k free, 10436k buffers
Swap: 2097148k total, 0k used, 2097148k free, 128068k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17220 root 20 0 165m 564 456 S 122.4 0.0 6:14.34 iperf
20 root 20 0 0 0 0 S 1.3 0.0 0:07.85 ksoftirqd/2
45 root 20 0 0 0 0 S 1.3 0.0 0:05.65 ksoftirqd/7
18404 root 20 0 220m 16m 6384 S 0.7 0.2 0:00.62 perf
35 root 20 0 0 0 0 S 0.3 0.0 0:07.73 ksoftirqd/5
1 root 20 0 23520 1624 1316 S 0.0 0.0 0:00.33 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
and ifconfig -a (eth6 is the NIC over which we run)
root@...cs44-005 ~]# ifconfig -a
br1 Link encap:Ethernet HWaddr 12:C0:46:32:46:6A
inet addr:192.168.52.144 Bcast:192.168.52.255 Mask:255.255.255.0
inet6 addr: fe80::2815:30ff:fe06:b5f9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:987575 errors:0 dropped:0 overruns:0 frame:0
TX packets:842756 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:39638896 (37.8 MiB) TX bytes:45313678898 (42.2 GiB)
eth0 Link encap:Ethernet HWaddr 00:50:56:25:4B:05
inet addr:10.212.75.5 Bcast:10.212.255.255 Mask:255.255.0.0
inet6 addr: fe80::250:56ff:fe25:4b05/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:193220 errors:0 dropped:55 overruns:0 frame:0
TX packets:17721 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17006297 (16.2 MiB) TX bytes:2871741 (2.7 MiB)
eth6 Link encap:Ethernet HWaddr 00:02:C9:E9:BB:B2
inet addr:192.168.30.144 Bcast:192.168.30.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:101512678 errors:0 dropped:0 overruns:0 frame:0
TX packets:995876432 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:10707213944 (9.9 GiB) TX bytes:1485292875970 (1.3 TiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:36 errors:0 dropped:0 overruns:0 frame:0
TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2456 (2.3 KiB) TX bytes:2456 (2.3 KiB)
veth0 Link encap:Ethernet HWaddr 32:7D:34:FA:3A:A1
inet addr:192.168.62.144 Bcast:192.168.62.255 Mask:255.255.255.0
inet6 addr: fe80::307d:34ff:fefa:3aa1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:85847361 errors:0 dropped:0 overruns:0 frame:0
TX packets:72371900 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5431514098 (5.0 GiB) TX bytes:728410479216 (678.3 GiB)
veth1 Link encap:Ethernet HWaddr 12:C0:46:32:46:6A
inet6 addr: fe80::10c0:46ff:fe32:466a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:72371915 errors:0 dropped:0 overruns:0 frame:0
TX packets:85847368 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:728410821246 (678.3 GiB) TX bytes:5431514476 (5.0 GiB)
vxlan42 Link encap:Ethernet HWaddr B2:F9:D2:68:A3:11
inet addr:192.168.42.144 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::b0f9:d2ff:fe68:a311/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:86834927 errors:0 dropped:0 overruns:0 frame:0
TX packets:73214688 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4269288656 (3.9 GiB) TX bytes:774896089976 (721.6 GiB)
no drops
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