From: Eric Dumazet <eric.dumazet@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Octavian Purdila <opurdila@ixiacom.com>,
Lucian Adrian Grijincu <lgrijincu@ixiacom.com>,
netdev@vger.kernel.org
Subject: Re: [RFC] [PATCH] udp: optimize lookup of UDP sockets to by including destination address in the hash key
Date: Thu, 05 Nov 2009 14:02:17 +0100 [thread overview]
Message-ID: <4AF2CCD9.7010507@gmail.com> (raw)
In-Reply-To: <877hu5892g.fsf@basil.nowhere.org>
Andi Kleen a écrit :
> Eric Dumazet <eric.dumazet@gmail.com> writes:
>> I have struct reorderings in progress to reduce number of cache lines read
>> per socket from two to one. So this would reduce by 50% time to find
>> a particular socket in the chain.
>
> Assuming that each access takes equal time seems like a rather dubious
> assumption. Consider caches.
Yes, and it depends on SMP affinities too.
I assume cache is cold or even on other cpu (worst case), dealing with
100.000+ sockets or so...
If workload fits in one CPU cache/registers, we dont mind taking one
or two cache lines per object, obviously.
next prev parent reply other threads:[~2009-11-05 13:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-04 21:03 [RFC] [PATCH] udp: optimize lookup of UDP sockets to by including destination address in the hash key Lucian Adrian Grijincu
2009-11-04 21:30 ` Eric Dumazet
2009-11-04 23:04 ` Octavian Purdila
2009-11-04 23:32 ` Eric Dumazet
2009-11-05 12:12 ` Andi Kleen
2009-11-05 13:02 ` Eric Dumazet [this message]
2009-11-05 14:54 ` Andi Kleen
2009-11-05 15:07 ` Eric Dumazet
2009-11-05 15:16 ` Andi Kleen
2009-11-05 16:25 ` Octavian Purdila
2009-11-05 16:36 ` Eric Dumazet
2009-11-05 17:03 ` Octavian Purdila
2009-11-05 17:39 ` Eric Dumazet
2009-11-06 18:34 ` Eric Dumazet
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