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Message-ID: <Pine.LNX.4.64.0810311300130.7072@wrl-59.cs.helsinki.fi> Date: Fri, 31 Oct 2008 13:01:45 +0200 (EET) From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> To: Eric Dumazet <dada1@...mosbay.com> cc: David Miller <davem@...emloft.net>, shemminger@...tta.com, zbr@...emap.net, rjw@...k.pl, mingo@...e.hu, s0mbre@...rvice.net.ru, a.p.zijlstra@...llo.nl, LKML <linux-kernel@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, efault@....de, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [tbench regression fixes]: digging out smelly deadmen. On Fri, 31 Oct 2008, Eric Dumazet wrote: > David Miller a écrit : > > From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> > > Date: Fri, 31 Oct 2008 11:40:16 +0200 (EET) > > > > > Let me remind that it is just a single process, so no ping-pong & other > > > lock related cache effects should play any significant role here, no? (I'm > > > no expert though :-)). > > > > Not locks or ping-pongs perhaps, I guess. So it just sends and > > receives over a socket, implementing both ends of the communication > > in the same process? > > > > If hash chain conflicts do happen for those 2 sockets, just traversing > > the chain 2 entries deep could show up. > > tbench is very sensible to cache line ping-pongs (on SMP machines of course) ...Sorry to disappoint you but we were discussion there on my AIM9 tcp_test results :-). -- i.
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