From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263270AbVGAHrK (ORCPT ); Fri, 1 Jul 2005 03:47:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261464AbVGAHrK (ORCPT ); Fri, 1 Jul 2005 03:47:10 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:6568 "EHLO e5.ny.us.ibm.com") by vger.kernel.org with ESMTP id S263268AbVGAHqq (ORCPT ); Fri, 1 Jul 2005 03:46:46 -0400 Date: Fri, 1 Jul 2005 13:26:00 +0530 From: Suparna Bhattacharya To: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: aio-stress throughput regressions from 2.6.11 to 2.6.12 Message-ID: <20050701075600.GC4625@in.ibm.com> Reply-To: suparna@in.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Has anyone else noticed major throughput regressions for random reads/writes with aio-stress in 2.6.12 ? Or have there been any other FS/IO regressions lately ? On one test system I see a degradation from around 17+ MB/s to 11MB/s for random O_DIRECT AIO (aio-stress -o3 testext3/rwfile5) from 2.6.11 to 2.6.12. It doesn't seem filesystem specific. Not good :( BTW, Chris/Ben, it doesn't look like the changes to aio.c have had an impact (I copied those back to my 2.6.11 tree and tried the runs with no effect) So it is something else ... Ideas/thoughts/observations ? Regards Suparna -- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Lab, India