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

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Date:	Tue, 01 Mar 2011 11:33:22 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Graf <tgraf@...radead.org>
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?

Le mardi 01 mars 2011 à 05:19 -0500, Thomas Graf a écrit :
> 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

Thats better ;)

You could do "cat /proc/net/udp" to check if drops occur on port 53
socket (last column)

But maybe your queryperf is limited to few queries in flight (default is
20 per queryperf instance) 


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