From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47370) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YNJVX-0002a2-L1 for qemu-devel@nongnu.org; Mon, 16 Feb 2015 06:06:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YNJVS-000574-LV for qemu-devel@nongnu.org; Mon, 16 Feb 2015 06:06:31 -0500 Received: from mailpro.odiso.net ([89.248.209.98]:35025) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YNJVS-00056t-FS for qemu-devel@nongnu.org; Mon, 16 Feb 2015 06:06:26 -0500 Date: Mon, 16 Feb 2015 12:06:24 +0100 (CET) From: Alexandre DERUMIER Message-ID: <1244767660.920598.1424084784168.JavaMail.zimbra@oxygem.tv> In-Reply-To: <54E0E974.4010301@profihost.ag> References: <54E0E974.4010301@profihost.ag> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Priebe Cc: qemu-devel H Stefan, only for write ? or also read ? I'll try to reproduce on my test cluster. ----- Mail original ----- De: "Stefan Priebe" =C3=80: "qemu-devel" Envoy=C3=A9: Dimanche 15 F=C3=A9vrier 2015 19:46:12 Objet: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2 Hi,=20 while i get a constant random 4k i/o write speed of 20.000 iops with=20 qemu 2.1.0 or 2.1.3. I get jumping speeds with qemu 2.2 (jumping between=20 500 iops and 15.000 iop/s).=20 If i use virtio instead of virtio-scsi speed is the same between 2.2 and=20 2.1.=20 Is there a known regression?=20 Greets,=20 Stefan=20