Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267628AbUIAU1h (ORCPT ); Wed, 1 Sep 2004 16:27:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267700AbUIAUYu (ORCPT ); Wed, 1 Sep 2004 16:24:50 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:46825 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S267696AbUIAUQx (ORCPT ); Wed, 1 Sep 2004 16:16:53 -0400 Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q7 From: Lee Revell To: Peter Zijlstra Cc: Thomas Charbonnel , Ingo Molnar , LKML , "K.R. Foley" , Mark_H_Johnson@raytheon.com In-Reply-To: <1094069473.7477.2.camel@twins> References: <200408282210.03568.pnambic@unu.nu> <20040828203116.GA29686@elte.hu> <1093727453.8611.71.camel@krustophenia.net> <20040828211334.GA32009@elte.hu> <1093727817.860.1.camel@krustophenia.net> <1093737080.1385.2.camel@krustophenia.net> <1093746912.1312.4.camel@krustophenia.net> <20040829054339.GA16673@elte.hu> <20040830090608.GA25443@elte.hu> <20040901082958.GA22920@elte.hu> <20040901135122.GA18708@elte.hu> <1094058546.6465.2.camel@localhost> <1094069473.7477.2.camel@twins> Content-Type: text/plain Message-Id: <1094069815.1970.52.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Wed, 01 Sep 2004 16:16:55 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1126 Lines: 32 On Wed, 2004-09-01 at 16:11, Peter Zijlstra wrote: > On Wed, 2004-09-01 at 19:09 +0200, Thomas Charbonnel wrote: > > Ingo Molnar wrote : > > > i've released the -Q7 patch: > > > > > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc1-bk4-Q7 > > > > With Q7 I still get rx latency issues (> 130 us non-preemptible section > > from rtl8139_poll). Moreover network connections were extremely slow > > (almost hung) until I set /proc/sys/net/core/netdev_backlog_granularity > > to 2. > > > > Thomas > > > > Me too! > I too have a rtl8139 network card. > > kr, what kind of nic do you have since this does not occur on your > machine? Hmm, I am not a network driver expert, and this is just a guess, but if they work anything like sound cards, I would say that that that hardware will only generate an interrupt when there are 2 packets in its queue. Lee - 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/