Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752035AbYJaLC1 (ORCPT ); Fri, 31 Oct 2008 07:02:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750761AbYJaLCP (ORCPT ); Fri, 31 Oct 2008 07:02:15 -0400 Received: from courier.cs.helsinki.fi ([128.214.9.1]:40909 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750756AbYJaLCO (ORCPT ); Fri, 31 Oct 2008 07:02:14 -0400 Date: Fri, 31 Oct 2008 13:01:45 +0200 (EET) From: "=?ISO-8859-1?Q?Ilpo_J=E4rvinen?=" X-X-Sender: ijjarvin@wrl-59.cs.helsinki.fi To: Eric Dumazet cc: David Miller , shemminger@vyatta.com, zbr@ioremap.net, rjw@sisk.pl, mingo@elte.hu, s0mbre@tservice.net.ru, a.p.zijlstra@chello.nl, LKML , Netdev , efault@gmx.de, Andrew Morton Subject: Re: [tbench regression fixes]: digging out smelly deadmen. In-Reply-To: <490AE1CD.9040207@cosmosbay.com> Message-ID: References: <20081031.005219.141937694.davem@davemloft.net> <20081031.025159.51432990.davem@davemloft.net> <490AE1CD.9040207@cosmosbay.com> MIME-Version: 1.0 Content-Type: MULTIPART/Mixed; boundary="=_courier-3486-1225449966-0001-2" Content-ID: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1469 Lines: 38 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --=_courier-3486-1225449966-0001-2 Content-Type: TEXT/PLAIN; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8BIT Content-ID: On Fri, 31 Oct 2008, Eric Dumazet wrote: > David Miller a ?crit : > > From: "Ilpo J?rvinen" > > 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. --=_courier-3486-1225449966-0001-2-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/