From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48383) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKjxP-0006HX-BD for qemu-devel@nongnu.org; Wed, 27 Mar 2013 02:35:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKjxO-0006qS-5u for qemu-devel@nongnu.org; Wed, 27 Mar 2013 02:35:35 -0400 Received: from mail-bk0-x229.google.com ([2a00:1450:4008:c01::229]:37287) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKjxN-0006qK-Vc for qemu-devel@nongnu.org; Wed, 27 Mar 2013 02:35:34 -0400 Received: by mail-bk0-f41.google.com with SMTP id i18so184353bkv.28 for ; Tue, 26 Mar 2013 23:35:33 -0700 (PDT) Date: Wed, 27 Mar 2013 07:35:29 +0100 From: Stefan Hajnoczi Message-ID: <20130327063529.GA13655@stefanha-thinkpad.redhat.com> References: <1364294326-22155-1-git-send-email-rjones@redhat.com> <20130326142139.GC26045@rhmail.home.annexia.org> <20130326162303.GB3391@stefanha-thinkpad.redhat.com> <20130326193443.GC1504@rhmail.home.annexia.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130326193443.GC1504@rhmail.home.annexia.org> Subject: Re: [Qemu-devel] [PATCH v3] block: Add support for Secure Shell (ssh) block device. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Richard W.M. Jones" Cc: qemu-devel@nongnu.org On Tue, Mar 26, 2013 at 07:34:43PM +0000, Richard W.M. Jones wrote: > > BTW, I'd be interested in tips on what software/techniques people use > for benchmarking qemu block devices. > > So far I've been testing this by booting various guests and timing how > long they take to reach various stages (eg. graphical login), but this > has not proven to be reproducible. Running fio inside the guest is the way to go for real benchmarking: http://freecode.com/projects/fio For quick benchmarks you could use one more more dd(1) processes: dd if=/dev/vdb of=/dev/null iflag=direct bs=64k Stefan