netdev - Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

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Message-ID: <20110611070952.GA24330@one.firstfloor.org>
Date:	Sat, 11 Jun 2011 09:09:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	andi@...stfloor.org
Subject: Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

On Sat, Jun 11, 2011 at 02:17:24PM +0800, Changli Gao wrote:
> On Sat, Jun 11, 2011 at 12:54 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Le samedi 11 juin 2011 à 08:54 +0800, Changli Gao a écrit :
> >
> >
> > Whole point of the exercice is to prepare ground for routing cache
> > removal :)
> >
> > If you want a server being hit by millions of clients around the world,
> > routing cache is a real pain because of memory needs.
> >
> 
> Yes. I know the routing cache removal is our goal. But for his
> scenario, there aren't so many routing cache entries, so routing cache
> may be a better option currently. However, if he just wants to

The routing cache has terrible cache line bouncing in the reference
count too.

-andi
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