From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org ([205.233.59.134]:59826 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751425Ab3EQKWv (ORCPT ); Fri, 17 May 2013 06:22:51 -0400 Date: Fri, 17 May 2013 12:22:44 +0200 From: Jens Axboe Subject: Re: latency measurements when adding thinktime Message-ID: <20130517102244.GV697@kernel.dk> References: <20130517074751.GS697@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: fio-owner@vger.kernel.org List-Id: fio@vger.kernel.org To: Edoardo Comar Cc: fio@vger.kernel.org On Fri, May 17 2013, Edoardo Comar wrote: > Hi Jens, > > thanks a lot, I tried your suggestion straight away: > The cpu line in the output shows that the job has not been idle at all. > but even with thinktime_spin, the latency stays high at at 150ms. > > Note also that if I increase thinktime & thinktime_spin by another 10000 > us > to a total of 20000, then the reported latency goes up another 150ms to a > total of 300ms. > Could this be a bug? It certainly could. Let me take a look here and see if I can reproduce it. -- Jens Axboe