From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin LaHaise Subject: Re: aio-stress throughput regressions from 2.6.11 to 2.6.12 Date: Fri, 1 Jul 2005 10:25:55 -0400 Message-ID: <20050701142555.GB31989@kvack.org> References: <20050701075600.GC4625@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from kanga.kvack.org ([66.96.29.28]:2478 "EHLO kanga.kvack.org") by vger.kernel.org with ESMTP id S263358AbVGAOY3 (ORCPT ); Fri, 1 Jul 2005 10:24:29 -0400 To: Suparna Bhattacharya Content-Disposition: inline In-Reply-To: <20050701075600.GC4625@in.ibm.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On Fri, Jul 01, 2005 at 01:26:00PM +0530, Suparna Bhattacharya wrote: > 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 :( What sort of io subsystem does it have? Also, does changing the elevator make any difference? I'm away for the long weekend, but will help look into this next week. -ben