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Date: Wed, 4 Dec 2013 01:30:09 +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 Wed, Dec 4, 2013 at 1:10 AM, Or Gerlitz <or.gerlitz@...il.com> wrote:
> 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
>
> $ ./perf record -e skb:kfree_skb -g -a sleep 10
> $ ./perf report -i perf.data
>
>
> Samples: 883K of event 'skb:kfree_skb', Event count (approx.): 883406
> + 97.13% swapper [kernel.kallsyms] [k] net_tx_action
> + 1.53% iperf [kernel.kallsyms] [k] net_tx_action
> + 1.03% perf [kernel.kallsyms] [k] net_tx_action
> + 0.27% ksoftirqd/7 [kernel.kallsyms] [k] net_tx_action
> + 0.03% kworker/7:1 [kernel.kallsyms] [k] net_tx_action
> + 0.00% rpcbind [kernel.kallsyms] [k] net_tx_action
> + 0.00% swapper [kernel.kallsyms] [k] kfree_skb
> + 0.00% sleep [kernel.kallsyms] [k] net_tx_action
> + 0.00% hald-addon-acpi [kernel.kallsyms] [k] kfree_skb
> + 0.00% iperf [kernel.kallsyms] [k] kfree_skb
> + 0.00% perf [kernel.kallsyms] [k] kfree_skb
I added proper sorting (thanks Rick), here's the passive side report
- 99.99% [kernel.kallsyms] [k] net_tx_action
?
- net_tx_action
?
- 59.20% __libc_recv
?
100.00% 0
?
- 35.61% __write_nocancel
?
- 100.00% run_builtin
?
main
?
__libc_start_main
?
- 2.60% __poll
?
- 92.62% run_builtin
?
main
?
__libc_start_main
?
- 7.38% 0x7f2d4c4adfd4
?
0x626370523a32333a
?
- 1.86% cmd_record
?
run_builtin
?
main
?
__libc_start_main
?
- 0.01% [kernel.kallsyms] [k] kfree_skb
?
- kfree_skb
?
- 50.00% __connect_nocancel
?
0x64697063612f6e75
?
- 33.33% __libc_recv
?
0
?
- 16.67% __write_nocancel
?
run_builtin
?
main
?
__libc_start_main
and the active side report
100.00% [kernel.kallsyms] [k] net_tx_action
?
- net_tx_action
?
- 76.91% __write_nocancel
?
- 100.00% run_builtin
?
main
?
__libc_start_main
?
15.92% 0x37cc60e4ed
?
- 2.69% __poll
?
run_builtin
?
main
?
__libc_start_main
?
- 1.92% cmd_record
?
run_builtin
?
main
?
__libc_start_main
?
- 1.66% pthread_cond_signal@@GLIBC_2.
3.2
?
0x10000
?
- 0.52% perf_header__has_feat
?
- 73.28% run_builtin
?
main
?
__libc_start_main
?
- 26.72% cmd_record
?
run_builtin
?
main
?
__libc_start_main
?
- 0.00% [kernel.kallsyms] [k] kfree_skb
?
- kfree_skb
?
- 100.00% __GI___connect_internal
?
- 50.00% get_mapping
?
__nscd_get_map_ref
?
50.00% __nscd_open_socket
>
>
>
>>
>>
>>
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