netdev - Re: Multicast packet loss

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Message-ID: <49838213.90700@cosmosbay.com>
Date:	Fri, 30 Jan 2009 23:41:23 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Kenny Chang <kchang@...enacr.com>
CC:	netdev@...r.kernel.org
Subject: Re: Multicast packet loss

Kenny Chang a écrit :
> Ah, sorry, here's the test program attached.
> 
> We've tried 2.6.28.1, but no, we haven't tried the 2.6.28.2 or the
> 2.6.29.-rcX.
> 
> Right now, we are trying to step through the kernel versions until we
> see where the performance drops significantly.  We'll try 2.6.29-rc soon
> and post the result.

2.6.29-rc contains UDP receive improvements (lockless)

Problem is multicast handling was not yet updated, but could be :)


I was asking you "cat /proc/interrupts" because I believe you might
have a problem NIC interrupts being handled by one CPU only (when having problems)


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