Re: Questions about the Linux network stack

From: Stephen Hemminger
Date: Tue May 29 2007 - 13:58:43 EST


On Tue, 29 May 2007 11:34:14 +0100
"Matthew Faulkner" <matthew.faulkner@xxxxxxxxx> wrote:

> Hey all,
>
> Not sure if this should be asked within this mailing list or netdev,
> so please accept my appologies if it's in the wrong place.
>
> I'd like to know what the best way to go about "profiling" the linux
> networking code is. There are a few different methods of profiling the
> linux from applications suchs as OProfile and simply booting the
> kernel with the profile=2 option and viewing the /proc/ system, but
> i'm not sure which (if any) will do the tasks i require.
>

Profiling measures the amount of CPU per function by sampling.


> Basically I want to profile and find out how long each stage of the
> network processing takes, for example, how long the TCP/IP processing
> takes (in softIRQ context?) and how long the hardware interupt takes?
> etc.

Arnaldo (acme) did something with probe insertion that did this.

> Thanks for your help
>
> Matt
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Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx>
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