From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261711AbUHVAGe (ORCPT ); Sat, 21 Aug 2004 20:06:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262106AbUHVAGd (ORCPT ); Sat, 21 Aug 2004 20:06:33 -0400 Received: from relay.pair.com ([209.68.1.20]:8208 "HELO relay.pair.com") by vger.kernel.org with SMTP id S261711AbUHVAGb (ORCPT ); Sat, 21 Aug 2004 20:06:31 -0400 X-pair-Authenticated: 66.190.51.173 Message-ID: <4127E386.5000701@cybsft.com> Date: Sat, 21 Aug 2004 19:06:30 -0500 From: "K.R. Foley" User-Agent: Mozilla Thunderbird 0.7.3 (X11/20040803) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Lee Revell CC: Ingo Molnar , linux-kernel , Florian Schmidt Subject: Re: [patch] voluntary-preempt-2.6.8.1-P7 References: <1092628493.810.3.camel@krustophenia.net> <20040816040515.GA13665@elte.hu> <1092654819.5057.18.camel@localhost> <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> <1093125390.817.22.camel@krustophenia.net> In-Reply-To: <1093125390.817.22.camel@krustophenia.net> X-Enigmail-Version: 0.85.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Lee Revell wrote: > On Sat, 2004-08-21 at 10:05, Ingo Molnar wrote: > >>i've uploaded the -P7 patch: >> >> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P7 >> >>Changes since -P6: >> >>- fixed the XFree86/X.org context-switch latency. (let me know if you >> see any weirdness like X not starting up while it did before.) >> >>- halved the pagevec size, to reduce the radix gang-lookup costs. >> > > > Great, this is a significant improvement. Most of the worst case > latencies (~150 usec) seem related to the TCP stack now, and a minor one > (51 usec) in the ext3 journaling: > > http://krustophenia.net/testresults.php?dataset=2.6.8.1-P7 > > Lee > I just posted a similar trace of ~4141 usec from P6 here: http://www.cybsft.com/testresults/2.6.8.1-P6/latency-trace1.txt This was part of a run from yesterday evening. After just rebooting, I too am seeing several of these. With the system not being hammered by the stress tests though, the max is only up to ~103 usec. I will be updating to P7 shortly. kr