From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org ([205.233.59.134]:45845 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756160Ab3GYSSK (ORCPT ); Thu, 25 Jul 2013 14:18:10 -0400 Message-ID: <51F16BCD.1000202@kernel.dk> Date: Thu, 25 Jul 2013 12:17:49 -0600 From: Jens Axboe MIME-Version: 1.0 Subject: Re: Weird trim test results References: <51F137D4.7000609@kernel.dk> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: fio-owner@vger.kernel.org List-Id: fio@vger.kernel.org To: Matthew Eaton Cc: fio@vger.kernel.org Please don't top post... On 07/25/2013 11:27 AM, Matthew Eaton wrote: > Hi Jens, > > I'm running Ubuntu 12.04.2, my kernel is: > > Linux matt-work 3.5.0-36-generic #57~precise1-Ubuntu SMP Thu Jun 20 > 18:21:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > > Here is the output I got from blktrace / blkparse: > > Total (sdb): > Reads Queued: 166, 664KiB Writes Queued: > 3001, 12004KiB > Read Dispatches: 166, 664KiB Write Dispatches: > 3001, 12004KiB > Reads Requeued: 0 Writes Requeued: 0 > Reads Completed: 166, 664KiB Writes Completed: > 3001, 1500KiB > Read Merges: 0, 0KiB Write Merges: > 0, 0KiB > PC Reads Queued: 0, 0KiB PC Writes Queued: > 0, 0KiB > PC Read Disp.: 22, 3KiB PC Write Disp.: > 0, 0KiB > PC Reads Req.: 0 PC Writes Req.: 0 > PC Reads Compl.: 10 PC Writes Compl.: 0 > IO unplugs: 166 Timer unplugs: 0 That looks fine, it might just be coincidence that you are capped at ~100 IOPS. I don't think it's that unlikely that the this is the limit for you, your device might have a fixed overhead associated with a trim request. I'd have to look closer at your system to see if that's the case or not. -- Jens Axboe