From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:54033) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIKuB-0000b3-QG for qemu-devel@nongnu.org; Wed, 20 Mar 2013 11:26:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UIKu7-0004Ip-6f for qemu-devel@nongnu.org; Wed, 20 Mar 2013 11:26:19 -0400 Received: from nodalink.pck.nerim.net ([62.212.105.220]:33615 helo=paradis.irqsave.net) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIKu6-0004If-Ua for qemu-devel@nongnu.org; Wed, 20 Mar 2013 11:26:15 -0400 Date: Wed, 20 Mar 2013 16:27:14 +0100 From: =?iso-8859-1?Q?Beno=EEt?= Canet Message-ID: <20130320152714.GB1473@irqsave.net> References: <1363770734-30970-1-git-send-email-benoit@irqsave.net> <1363770734-30970-2-git-send-email-benoit@irqsave.net> <20130320132924.GB14441@stefanha-thinkpad.muc.redhat.com> <20130320142842.GA2389@stefanha-thinkpad.muc.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20130320142842.GA2389@stefanha-thinkpad.muc.redhat.com> Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] [PATCH] block: fix bdrv_exceed_iops_limits wait computation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: kwolf@redhat.com, wuzhy@linux.vnet.ibm.com, qemu-devel@nongnu.org, Stefan Hajnoczi > Now there is no oscillation and the wait_times do not grow or shrink > under constant load from dd(1). > > Can you try this patch by itself to see if it fixes the oscillation? On my test setup it fixes the oscillation and lead to an average 149.88 i= ops. However another pattern appear. iostat -d 1 -x will show something between 150 and 160 iops for several s= ample then a sample would show around 70 iops to compensate for the additional = ios and this cycle restart. Best regards Beno=EEt