From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 28 Aug 2001 08:40:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 28 Aug 2001 08:40:28 -0400 Received: from fe090.worldonline.dk ([212.54.64.152]:37892 "HELO fe090.worldonline.dk") by vger.kernel.org with SMTP id ; Tue, 28 Aug 2001 08:40:16 -0400 Date: Tue, 28 Aug 2001 14:43:26 +0200 From: Jens Axboe To: Christoph Rohland Cc: Linux Kernel , "David S. Miller" Subject: Re: [patch] zero-bounce block highmem I/O, #13 Message-ID: <20010828144326.R642@suse.de> In-Reply-To: <20010827123700.B1092@suse.de> <20010828125520.L642@suse.de> <20010828134141.M642@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 28 2001, Christoph Rohland wrote: > Hi Jens, > > On Tue, 28 Aug 2001, Jens Axboe wrote: > > Ok found the bug -- SCSI was accidentally using blk_seg_merge_ok > > when it just wanted to test if we were crossing a 4GB physical > > address boundary or not. Doh! Attached incremental patch should fix > > the SCSI performance issue. I'm testing right now... > > Yup, performance is back to 2.4.9 level. But I do not see an > improvement. > > I will now do a database import. Of course it depends on the type of work load how big an improvement you see. How much RAM is in the machine? It would be interesting to see profiles of stock + highmem kernels. -- Jens Axboe