From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262005AbVEaRXV (ORCPT ); Tue, 31 May 2005 13:23:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262006AbVEaRTf (ORCPT ); Tue, 31 May 2005 13:19:35 -0400 Received: from moutvdom.kundenserver.de ([212.227.126.249]:16576 "EHLO moutvdomng.kundenserver.de") by vger.kernel.org with ESMTP id S261994AbVEaRQg (ORCPT ); Tue, 31 May 2005 13:16:36 -0400 Message-ID: <429C9BFA.5090901@robotech.de> Date: Tue, 31 May 2005 19:16:42 +0200 From: Tobias Reinhard User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Problem with concurrent SATA-Writes Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I have a problem with two SATA-Discs. I have an onboard SIL3114 with four SATA-Ports an onboard NVIDIA with two SATA-Ports - both controllers are disable via BIOS (and are not detected by Linux)(only for this test of course - normally I have other HDD on this ports). The only controller that is found is the add-on controller in a PCI-Slot (SIL3112). And that is the one I have trouble with. If I read or write (via dd) from the first one -> no problems. Same when read or write from the second or when I read (only read!) from both at the same time. Data-Transfer-Rate is around 45MB/s for one HDD. The problem occures when I try to write on both discs at the same time. For example I write /dev/zero to the first one and then start to write /dev/zero to the second one. The System-Load goes up to 4 with nearly 100% io-wait and nearly no write-access to the drives. Any hints? - no errormessages in syslog - happens with Kernel 2.6.11.7 and with 2.6.12-rc5 - HDDs are Samsung Spinpoint 200GB - (I use the SCSI-SATA-Drivers) Tobias