netdev - Re: [RFC] Could we avoid touching dst->refcount in some cases ?

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Message-ID: <20081124112709.GX6703@one.firstfloor.org>
Date:	Mon, 24 Nov 2008 12:27:09 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC] Could we avoid touching dst->refcount in some cases ?

On Mon, Nov 24, 2008 at 11:14:29AM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >Eric Dumazet <dada1@...mosbay.com> writes:
> >
> >>tbench has hard time incrementing decrementing the route cache refcount
> >>shared by all communications on localhost.
> >
> >iirc there was a patch some time ago to use per CPU loopback devices to 
> >avoid this, but it was considered too much a benchmark hack.
> >As core counts increase it might stop being that though.
> 
> Well, you probably mention Stephen patch to avoid dirtying other contended
> cache lines (one napi structure per cpu)

No that patch wasn't from Stephen. iirc it was from someone at SGI.

-Andi

-- 
ak@...ux.intel.com
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