RE: Questions about the Linux network stack

From: Jeff Haran
Date: Tue May 29 2007 - 14:14:22 EST


> -----Original Message-----
> From: linux-net-owner@xxxxxxxxxxxxxxx
> [mailto:linux-net-owner@xxxxxxxxxxxxxxx] On Behalf Of Matthew Faulkner
> Sent: Tuesday, May 29, 2007 3:34 AM
> To: linux-net@xxxxxxxxxxxxxxx
> Subject: Re: Questions about the Linux network stack
>
> 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.
>
> 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.

The Linux Trace Toolkit (LTT) might do the trick, though you might need
to modify the kernel to trace the the specific events you are interested
in.

Jeff Haran
Brocade

>
> Thanks for your help
>
> Matt
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