From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: Max IO size Date: Fri, 2 Aug 2002 08:39:25 +0200 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20020802063925.GF1512@suse.de> References: <20020801235432.14372.qmail@web14005.mail.yahoo.com> <20020802051712.56283.qmail@web14005.mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20020802051712.56283.qmail@web14005.mail.yahoo.com> List-Id: linux-scsi@vger.kernel.org To: Mukul Kotwani Cc: linux-scsi@vger.kernel.org On Thu, Aug 01 2002, Mukul Kotwani wrote: > > In fact, even with a max_sectors size set to 1, I > still get a 1k IO doing 512 byte reads with IOmeter! > > Can someone please clarify? The lowest limit you can set is 8 sectors. Anything below that is not guarenteed to be honored (it depends on the soft block size of the file system, or 1kb if there is no fs mounted on the device). -- Jens Axboe