netdev - Re: Multicast packet loss

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Message-ID: <alpine.DEB.1.10.0902271441220.9381@qirst.com>
Date:	Fri, 27 Feb 2009 14:45:27 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Kenny Chang <kchang@...enacr.com>, netdev@...r.kernel.org
Subject: Re: Multicast packet loss

On Fri, 27 Feb 2009, Eric Dumazet wrote:

> Christoph Lameter a ?crit :
> > On Fri, 30 Jan 2009, Eric Dumazet wrote:
> >> 2.6.29-rc contains UDP receive improvements (lockless)
> >> Problem is multicast handling was not yet updated, but could be :)
> > When will that happen?
> When proven necessary :)
>
> Kenny problem is about scheduling storm. The extra spin_lock() in UDP
> multicast receive is not a problem.

My tests here show that 2.6.29-rc5 still looses ~5usec vs. 2.6.22 via
UDP. This would fix a regression.....

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