From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Prakash K. Cheemplavam" Subject: Re: poor sata performance on 2.6 Date: Thu, 15 Apr 2004 16:52:04 +0200 Sender: linux-ide-owner@vger.kernel.org Message-ID: <407EA194.20904@gmx.de> References: <200404150236.05894.kos@supportwizard.com> <200404151826.54488.kos@supportwizard.com> <1082039593.19568.75.camel@lotte.street-vision.com> <200404151848.05857.kos@supportwizard.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from pop.gmx.de ([213.165.64.20]:40107 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S264273AbUDOOwI (ORCPT ); Thu, 15 Apr 2004 10:52:08 -0400 In-Reply-To: <200404151848.05857.kos@supportwizard.com> List-Id: linux-ide@vger.kernel.org To: Konstantin Sobolev Cc: Justin Cormack , Ryan Geoffrey Bourgeois , Kernel mailing list , linux-ide@vger.kernel.org Konstantin Sobolev wrote: > On Thursday 15 April 2004 18:33, Justin Cormack wrote: > >>On Thu, 2004-04-15 at 15:26, Konstantin Sobolev wrote: >> >>>On Thursday 15 April 2004 18:00, Justin Cormack wrote: >>> >>>>hmm, odd. I get 50MB/s or so from normal (7200, 8MB cache) WD disks, >>>>and Seagate from the same controller. Can you send lspci, >>>>/proc/interrupts and dmesg... >>> >>>Attached are files for 2.6.5-mm5 with highmem, ACPI and APIC turned off. >> >>ah. Make a filesystem on it and mount it and try again. I see you have >>no partition table and so probably no filesystem. This means the block >>size is set to default 512byte not 4k which makes disk operations slow. >>Any filesystem should default to block size of 4k, eg ext2. > > > Very interesting! > created partition table, > kos sata # mkfs.ext2 /dev/sda1 > [..skipped..] > kos mnt # cd / > kos / # mkdir wd > kos / # mount /dev/sda1 /wd > kos / # hdparm -t -a8192 /dev/sda [snip] > So first time it gave the same loosy 27 MB/s and subsequent tests give pretty > good 68 MB/s! Why? I once reported that to lkml but got no reaction. siimage.c doesn't show this behaviour. Prakash