netdev - Re: SO_REUSEPORT - can it be done in kernel?

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Message-ID: <20110301101955.GI9763@canuck.infradead.org>
Date:	Tue, 1 Mar 2011 05:19:55 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>, rick.jones2@...com,
	therbert@...gle.com, wsommerfeld@...gle.com,
	daniel.baluta@...il.com, netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

On Mon, Feb 28, 2011 at 06:07:49PM +0100, Eric Dumazet wrote:
> > The numbers differ a lot depending on the architecture we test on.
> > 
> > F.e. on a 12 core AMD with 2 NUMA nodes:
> > 
> > 2.6.32   named -n 1: 37.0kqps
> >          named:       3.8kqps (yes, no joke, the socket receive buffer is
> >                                always full and the kernel drops pkts)
> 
> Yes, this old kernel miss commit c377411f2494a93 added in 2.6.35
> (net: sk_add_backlog() take rmem_alloc into account)

I retested with net-2.6 w/o Herbert's patch:

named -n 1: 36.9kqps
named:      16.2kqps

> > 2.6.38-rc5+ with Herbert's patches:
> >         named -n 1:  36.9kqps
> >         named:      222.0kqps
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