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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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