netdev - Re: [RFC] [PATCH] udp: optimize lookup of UDP sockets to by including destination address in the hash key

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Message-ID: <20091105151623.GT31511@one.firstfloor.org>
Date:	Thu, 5 Nov 2009 16:16:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Octavian Purdila <opurdila@...acom.com>,
	Lucian Adrian Grijincu <lgrijincu@...acom.com>,
	netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] udp: optimize lookup of UDP sockets to by including destination address in the hash key

On Thu, Nov 05, 2009 at 04:07:25PM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >> I assume cache is cold or even on other cpu (worst case), dealing with
> >> 100.000+ sockets or so...
> > 
> > Other CPU cache hit is actually typically significantly 
> > faster than a DRAM access (unless you're talking about a very large NUMA 
> > system and a remote CPU far away)
> 
> Even if data is dirty in remote CPU cache ? 

Some cache protocols have to force dirty data through DRAM, but modern
ones usually do not.

-Andi
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