netdev - Re: many sockets, slow sendto

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Message-ID: <p73bqj6b2gk.fsf@bingen.suse.de>
Date:	06 Mar 2007 20:23:55 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Zaccomer Lajos <zacco@...hu>
Cc:	netdev@...r.kernel.org
Subject: Re: many sockets, slow sendto

Zaccomer Lajos <zacco@...hu> writes:

> I'm playing around with a simulation, in which many thousands of IP
> 
> addresses (on interface aliases) are used to send/receive TCP/UDP

Something seems to be wrong with your emailer. It adds a empty
line between each real line.

> 
> packets. I noticed that the time of send/sendto increased linearly
> 
> with the number of file descriptors, and I found it rather strange.

Yes that is strange. I would suggest you use oprofile to identify which
parts of the kernel use the CPU time with many descriptors.

-Andi
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