Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030659AbXBGU7K (ORCPT ); Wed, 7 Feb 2007 15:59:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030640AbXBGU7K (ORCPT ); Wed, 7 Feb 2007 15:59:10 -0500 Received: from 81-174-33-43.f5.ngi.it ([81.174.33.43]:50521 "EHLO develer.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1030659AbXBGU7I (ORCPT ); Wed, 7 Feb 2007 15:59:08 -0500 X-Spam-Virus: No Message-ID: <45CA3D1E.9030203@develer.com> Date: Wed, 07 Feb 2007 21:57:02 +0100 From: Bernardo Innocenti Organization: Develer S.r.l. - http://www.develer.com/ User-Agent: Thunderbird 1.5.0.9 (X11/20070131) MIME-Version: 1.0 To: dougg@torque.net CC: mpt_linux_developer@lsil.com, lkml , Develer IT Infrastructure , linux-scsi@vger.kernel.org Subject: Re: Writing performance problem with SAS1068 References: <45C84333.709@develer.com> <45C8D686.7010103@torque.net> In-Reply-To: <45C8D686.7010103@torque.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-DSPAM-Result: Whitelisted X-DSPAM-Processed: Wed Feb 7 21:58:45 2007 X-DSPAM-Confidence: 0.9997 X-DSPAM-Probability: 0.0000 X-DSPAM-Signature: 45ca3d85255367224429326 X-DSPAM-Factors: 27, Organization*http+www, 0.00010, Subject*Re+Writing, 0.00010, CC*kernel, 0.00010, CC*kernel, 0.00010, CC*lkml+linux, 0.00010, CC*lkml, 0.00010, CC*kernel+org, 0.00010, CC*kernel+org, 0.00010, Organization*www, 0.00010, CC*vger, 0.00010, CC*vger, 0.00010, CC*vger+kernel, 0.00010, CC*vger+kernel, 0.00010, Develer+S, 0.00010, CC*org, 0.00010, CC*org, 0.00010, CC*linux, 0.00017, CC*linux, 0.00017, Subject*Writing+performance, 0.00020, CC*scsi+vger, 0.00020, Subject*SAS1068, 0.00020, CC*developer, 0.00020, CC*scsi, 0.00020, Subject*with+SAS1068, 0.00020, Subject*performance+problem, 0.00020, CC*linux+scsi, 0.00020, CC*linux+kernel, 0.00021 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 832 Lines: 23 Douglas Gilbert wrote: > You may like to check that Write Cache Enable is on with: > 'sdparm --get=WCE /dev/sdd'. Yeah, yeah! Works fine once I toggled the WCE to 1. Writing flies at 70MB/s, which is extremely good for those desktop-grade disks (Seagate Barracuda SATA 250GB @7200RPM). Thank you very much! But... who do you think I should bug to make this the system default? Does write caching need to be enabled by the driver itself, in the SCSI layer or perhaps by the distro initscripts? -- // Bernardo Innocenti - Develer S.r.l., R&D dept. \X/ http://www.develer.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/