From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268345AbUHWXyN (ORCPT ); Mon, 23 Aug 2004 19:54:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268845AbUHWXxM (ORCPT ); Mon, 23 Aug 2004 19:53:12 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:18321 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S269003AbUHWXtd (ORCPT ); Mon, 23 Aug 2004 19:49:33 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8.1-P7 From: Lee Revell To: Ingo Molnar Cc: linux-kernel , Florian Schmidt In-Reply-To: <20040823194330.GA6539@elte.hu> References: <20040816113131.GA30527@elte.hu> <20040816120933.GA4211@elte.hu> <1092716644.876.1.camel@krustophenia.net> <20040817080512.GA1649@elte.hu> <20040819073247.GA1798@elte.hu> <20040820133031.GA13105@elte.hu> <20040820195540.GA31798@elte.hu> <20040821140501.GA4189@elte.hu> <1093160993.817.46.camel@krustophenia.net> <1093282713.826.13.camel@krustophenia.net> <20040823194330.GA6539@elte.hu> Content-Type: text/plain Message-Id: <1093304968.862.11.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Mon, 23 Aug 2004 19:49:29 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2004-08-23 at 15:43, Ingo Molnar wrote: > * Lee Revell wrote: > > > to file a bug report. Traces can be found here: > > > > http://krustophenia.net/2.6.8.1-P7 > > re the skb latencies: Mark H Johnson managed to reduce net-input > latencies by decreasing /proc/sys/net/core/netdev_max_backlog to 8 - > could you try this, does it help? (you could try an even more extreme > setting like 4.) > Spoke too soon with my last report. I am actually still seeing latencies close to 200 usecs in netdev_process_backlog. Reducing netdev_max_backlog to 4, then 2 did not seem to help. netdev_process_backlog = 4: http://krustophenia.net/testresults.php?dataset=2.6.8.1-P8#/var/www/2.6.8.1-P8/trace9.txt netdev_process_backlog = 2: http://krustophenia.net/testresults.php?dataset=2.6.8.1-P8#/var/www/2.6.8.1-P8/trace12.txt Lee