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Date: Mon, 9 Nov 2009 17:38:26 +0200 From: Octavian Purdila <opurdila@...acom.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org, lgrijincu@...acom.com Subject: Re: [PATCH 0/8 net-next-2.6] udp: optimisations On Monday 09 November 2009 07:37:24 you wrote: > David Miller a écrit : > > Looks great, all applied, thanks Eric. > > Thanks David, I'll make the remaining patches too. > > > I would even go so far as to say that the cutoff to the second hash > > table should be even lower than 10, like maybe 4 or 5. > > Probably, but we want to avoid the secondary way if possible, > as this path might have to traverse two different chains. > > (total of three cache line accesses to only take a look at chains > head/count) > > Maybe we can change the heuristic to take into account this like that : > > if (hslot->count > 4) { > ... > if (hslot->count < hslot2->count * 2) > goto begin_primary_hash_lookup; > > This is tuning, and needs benchmarking. > Eric, thanks a lot ! Lucian is currently testing it on our setup and once we iron out some IPv6 issues we are seeing he will follow up with some numbers. -- 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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