From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261656AbVGDUeG (ORCPT ); Mon, 4 Jul 2005 16:34:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261637AbVGDUeG (ORCPT ); Mon, 4 Jul 2005 16:34:06 -0400 Received: from [212.76.87.97] ([212.76.87.97]:20485 "EHLO raad.intranet") by vger.kernel.org with ESMTP id S261635AbVGDUeA (ORCPT ); Mon, 4 Jul 2005 16:34:00 -0400 Message-Id: <200507042033.XAA19724@raad.intranet> From: "Al Boldi" To: "'Bartlomiej Zolnierkiewicz'" , "'Ondrej Zary'" Cc: "'Linus Torvalds'" , , Subject: RE: [git patches] IDE update Date: Mon, 4 Jul 2005 23:32:50 +0300 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: <58cb370e0507041251dd5a@mail.gmail.com> Thread-Index: AcWA0U98sphn5/QgQDuV5i1NM3Xs3gAAomoQ X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bartlomiej Zolnierkiewicz wrote: { > > > >>On 7/4/05, Al Boldi wrote: > >>Hdparm -tT gives 38mb/s in 2.4.31 > >>Cat /dev/hda > /dev/null gives 2% user 33% sys 65% idle > >> > >>Hdparm -tT gives 28mb/s in 2.6.12 > >>Cat /dev/hda > /dev/null gives 2% user 25% sys 0% idle 73% IOWAIT > >> > >>It feels like DMA is not being applied properly in 2.6.12. > > > > Same on 2.6.10,11,12. > > No errors though, only sluggish system. What about earlier kernels? Please try to narrow down the problem to a specific kernel version. } Don't know about 2.6.0-2.6.9, but 2.4.31 is ok. Bartlomiej, When you compare 2.4.31 with 2.6.12 don't you see this problem on your machine? If you have a fast system the slowdown won't show, but your IOWAIT will be higher anyway! It feels like running on PIO instead of DMA.