Subject: Re: Multicast packet loss

From: Eric Dumazet <[email-masked]>
Date: Fri, 30 Jan 2009 23:41:23 +0100

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)