From mboxrd@z Thu Jan 1 00:00:00 1970 From: bloch@verdurin.com Subject: Re: Very slow writes with mptsas Date: Thu, 7 Jun 2007 22:42:32 +0100 Message-ID: <20070607214229.GG6519@bloch.config> References: <20070605161620.GB6519@bloch.config> <7579f7fb0706052232x44db1f7he88a50646a3c57db@mail.gmail.com> <4666F7A0.8080605@torque.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from 87-194-8-112.bethere.co.uk ([87.194.8.112]:53864 "EHLO bloch.config" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753575AbXFGVmp (ORCPT ); Thu, 7 Jun 2007 17:42:45 -0400 Content-Disposition: inline In-Reply-To: <4666F7A0.8080605@torque.net> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Douglas Gilbert Cc: Matthew Jacob , linux-scsi@vger.kernel.org, linux-precision@dell.com On Wed, 06 Jun 2007, Douglas Gilbert wrote: > Matthew Jacob wrote: > > The FreeBSD problem was fixed by Scott Long a couple of days ago by > > doing some cut through SAS stuff that enabled Write Cache for SATA > > drives. Why LSI-Logic couldn't just blitheringly synthesize mode page > > 8 is beyond me, but okay. > > > > I dunno whether the issue here is the same one Scott tackled- probably > > given the messages. Eric- you listening in on this? > > Matt, > Just in case Eric doesn't answer, I suspect if the > HBA firmware can be upgraded (from Dell or LSI?) then > WCE (write cache enable) in the caching mode page > will be supported. It is one of the few mode page > settings that is required to be implemented in SAT. > > The other field that should be changeable is DRA > (disable read ahead). Both work on my LSI SAS HBA. > > Doug Gilbert > I upgraded to the latest Dell firmware, but the kernel message is the same - write cache disabled, and the write speed is still very bad. No sign of new changeable options. Can't actually see any firmware on the LSI site. Adam