From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:40513) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sz8xI-0007bW-3r for qemu-devel@nongnu.org; Wed, 08 Aug 2012 12:17:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sz8xG-0006Js-SY for qemu-devel@nongnu.org; Wed, 08 Aug 2012 12:17:56 -0400 Received: from mail-pb0-f45.google.com ([209.85.160.45]:35461) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sz8xG-0006Jo-N1 for qemu-devel@nongnu.org; Wed, 08 Aug 2012 12:17:54 -0400 Received: by pbbrp12 with SMTP id rp12so1201498pbb.4 for ; Wed, 08 Aug 2012 09:17:53 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <5022912B.2000607@redhat.com> Date: Wed, 08 Aug 2012 18:17:47 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <502283FA.2080506@profihost.ag> In-Reply-To: <502283FA.2080506@profihost.ag> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Priebe Cc: qemu-devel Il 08/08/2012 17:21, Stefan Priebe ha scritto: > Hello list, > > i wanted to start using virtio-scsi instead of virtio-blk, cause it > offers the possibility to use discard / trim support. > > Kernel: 3.5.0 on host and guest > Qemu-kvm: 1.1.1 stable > > But i'm not seeing the same or nearly the same speed: 1) How did you start the guest? Did you use cache=none? 2) Please try the latest qemu-kvm release. 1.1 didn't use ioeventfd for virtio-scsi by mistake. Paolo