From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751139AbVJ2Emj (ORCPT ); Sat, 29 Oct 2005 00:42:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751140AbVJ2Emj (ORCPT ); Sat, 29 Oct 2005 00:42:39 -0400 Received: from [67.137.28.189] ([67.137.28.189]:63873 "EHLO vger.utah-nac.org") by vger.kernel.org with ESMTP id S1751139AbVJ2Emj (ORCPT ); Sat, 29 Oct 2005 00:42:39 -0400 Message-ID: <4362E96F.8080209@utah-nac.org> Date: Fri, 28 Oct 2005 21:15:59 -0600 From: jmerkey User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040510 X-Accept-Language: en-us, en MIME-Version: 1.0 To: jmerkey Cc: Nick Piggin , Jeff Garzik , "Chen, Kenneth W" , linux-kernel@vger.kernel.org, Jens Axboe Subject: Re: kernel performance update - 2.6.14 References: <200510282344.j9SNihg27345@unix-os.sc.intel.com> <4362BA30.2020504@pobox.com> <4362A9A7.2090101@utah-nac.org> <4362E329.8040204@yahoo.com.au> <4362E71A.6030904@utah-nac.org> <4362E7B3.6020509@utah-nac.org> In-Reply-To: <4362E7B3.6020509@utah-nac.org> 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 And one other item. Setting the build to preemptible kernel seems to improve I/O performance relative to 2.6.9, if you don't use it, the console has long periods where user processes are getting starved under extremely heavy I/O loads. Jeff jmerkey wrote: > jmerkey wrote: > >> Nick Piggin wrote: >> >>> Jeff V. Merkey wrote: >>> >>>> >>>> Verified. These numbers reflect my measurements as well. I have not >>>> moved off 2.6.9 to newer kernels on shipping products due to these >>>> issues. There are also serious stability issues as well, though >>>> 2.6.14 seems a little better than than previous kernels. Jeff >>>> >>> >>> These issues aren't going to fix themselves. Did you investigate >>> any of the performance or (more importantly) stability problems? >> >> >> > Added a little more clarification. > > Jeff > >> Yes I did. The list wasn't too long. I had problems with RCU messages >> and irq warn messages at very high loads and init respawning itself >> subjected to loads > 369 MB/S to the disk channels on 2.6.13. >> Performance was down on disk I/O [vs.] 2.6.9. I did not investigate >> the BIO fixes but something changed there. Theres also some memory >> problems with corruption somewhere in the 2.6.14 (during module >> unload and shutdown). >> >> Jeff >> > > - > 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/ >