From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261459AbVFMKTz (ORCPT ); Mon, 13 Jun 2005 06:19:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261461AbVFMKTz (ORCPT ); Mon, 13 Jun 2005 06:19:55 -0400 Received: from smtp203.mail.sc5.yahoo.com ([216.136.129.93]:62542 "HELO smtp203.mail.sc5.yahoo.com") by vger.kernel.org with SMTP id S261459AbVFMKTx (ORCPT ); Mon, 13 Jun 2005 06:19:53 -0400 Message-ID: <42AD5DC6.6090205@yahoo.com.au> Date: Mon, 13 Jun 2005 20:19:50 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050324 Debian/1.7.6-1 X-Accept-Language: en MIME-Version: 1.0 To: Con Kolivas CC: linux-kernel@vger.kernel.org Subject: Re: [RFC] blkstat References: <42AD55FA.50109@yahoo.com.au> <200506131954.45361.kernel@kolivas.org> <42AD59A9.3030404@yahoo.com.au> <200506132005.40846.kernel@kolivas.org> In-Reply-To: <200506132005.40846.kernel@kolivas.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: > On Mon, 13 Jun 2005 20:02, Nick Piggin wrote: > >>The problem with that is that it does not give you a % idle >>figure on the block device, so you basically can't see if >>the device is becoming a bottleneck. > > > I've often wondered how iostat gives a %busy figure and whether this > translated accurately without further info from the kernel. > > Oh, it does havea "%util" in its extended stats. Sorry I missed that so you might be right. Hmm, so I guess it uses io_ticks and that does appear to give the valid measure. I'll have a think about that - perhaps there is still a place for the split read/write statistics I'm using... Thanks, Nick -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com