Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269814AbUJVHCp (ORCPT ); Fri, 22 Oct 2004 03:02:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269640AbUJVHBy (ORCPT ); Fri, 22 Oct 2004 03:01:54 -0400 Received: from smtp200.mail.sc5.yahoo.com ([216.136.130.125]:25216 "HELO smtp200.mail.sc5.yahoo.com") by vger.kernel.org with SMTP id S269814AbUJVGzD (ORCPT ); Fri, 22 Oct 2004 02:55:03 -0400 Message-ID: <4178AEC0.5050603@yahoo.com.au> Date: Fri, 22 Oct 2004 16:54:56 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040820 Debian/1.7.2-4 X-Accept-Language: en MIME-Version: 1.0 To: Peter Zaitsev CC: linux-kernel@vger.kernel.org, andrea@novell.com, alexeyk@mysql.com, markw@osdl.org Subject: Re: IO performance problems with 2.6.9 References: <1098426220.5482.235.camel@sphere.site> In-Reply-To: <1098426220.5482.235.camel@sphere.site> 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 Content-Length: 935 Lines: 23 Peter Zaitsev wrote: > 4) Unrelated but still unfortunate. 2.6.9 kernel seems to behave weird > if swap is disabled. I was running with 8G of memory allocating 6G for > MySQL buffers which left about 1.5G for kernel, 1G of which was used > for file cache. During IO intensive run, using buffered IO I got > "kswapd" running like a crazy taking 90% of CPU time on one of CPUs. > What for is it running if there is no swap files enabled ? > Can you boot with profile=2, and get a profile of about 30 seconds while kswapd is going crazy please? Also capture /proc/vmstat before and after that interaval. Can you also capture a the output of vmstat 1 while this is happening Thanks - 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/