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Message-ID: <1302617026.3233.49.camel@edumazet-laptop>
Date: Tue, 12 Apr 2011 16:03:46 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: zhou rui <zhourui.cn@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: profile my proto_hook.function
Le mardi 12 avril 2011 à 22:00 +0800, zhou rui a écrit :
> hi
> I used a prot_hook(added via dev_add_pack,protocol=ETH_P_ALL) to
> process packets in kernel part.but the performance was bad
>
> ksoftirqd used almost 100% cpu on my 1G nic(intel e1000,w/o RSS) XEON
> 5400 hypertown machine.
>
> looks my packet processing is too slow. but how to profile this?
> i.e. how many CPU resources used in softirq and normal kernel protocol
> stack(tcp/ip,etc)
> and how many used in my packet processing function?
>
> and any idea to improve it?how about moving the processing function to driver?
You coud use perf tool, included in kernel sources
# cd ~your_kernel_sources
# cd tools/perf
# make
<run your workload, and record activity :>
# ./perf record -a -g sleep 10
Then later, you can take a look at results
./perf report
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