From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Higdon Subject: Re: [RFC PATCH 2.6.9-rc2] Add sysfs queue depth override to qla2xxx Date: Tue, 28 Sep 2004 17:36:11 -0700 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20040929003611.GK192475@sgi.com> References: <20040928193614.GB192475@sgi.com> <1096401196.2008.97.camel@mulgrave> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from omx2-ext.sgi.com ([192.48.171.19]:45459 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S268113AbUI2AgZ (ORCPT ); Tue, 28 Sep 2004 20:36:25 -0400 Content-Disposition: inline In-Reply-To: <1096401196.2008.97.camel@mulgrave> List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: Andrew Vasquez , SCSI Mailing List So do we have a consensus on what the driver should limit queue depth to? Currently, it's 32 or ql2xmaxqdepth, if that was specified. >>From what I can see, ql2xmaxqdepth is effectively limited to 65535. We don't want one lun to use host driver or host adapter resources to the point that it starves other luns. Ideally, the max would depend on what else was attached, but I don't think we want to make this too complicated. Anyone changing the queue depth should have a clue about what they're doing. Andrew, how many command slots are there in the various adapters, and do the continuation entries each eat a command slot? jeremy