From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LoHla-00071j-ST for qemu-devel@nongnu.org; Mon, 30 Mar 2009 09:43:07 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LoHlT-00070S-OB for qemu-devel@nongnu.org; Mon, 30 Mar 2009 09:43:04 -0400 Received: from [199.232.76.173] (port=51268 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LoHlR-000700-Jv for qemu-devel@nongnu.org; Mon, 30 Mar 2009 09:42:58 -0400 Received: from mail-bw0-f220.google.com ([209.85.218.220]:51806) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LoHlR-0006zp-03 for qemu-devel@nongnu.org; Mon, 30 Mar 2009 09:42:57 -0400 Received: by bwz20 with SMTP id 20so1778251bwz.34 for ; Mon, 30 Mar 2009 06:42:55 -0700 (PDT) MIME-Version: 1.0 Date: Mon, 30 Mar 2009 15:42:55 +0200 Message-ID: <68bb87b70903300642q26dc4187ufd3e2ad93e77d767@mail.gmail.com> From: Patrizio Boschi Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Benchmarks reliability Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org I was doing some benchmarks (with lmbench, dbench, whetstone and compile times) to figure out guest/host performance ratios. Are the results reliable? When benching the guest, i'm actually using a little client/server program to launch some workloads on the guest and have them timed (with gettimeofday) both on the guest and the host; for now i always got the same values (except when i manually stop and resume the guest), e.g. 12345 msecs on the guest are also ~12345 msecs on the host. But i'd like to know if this is always true, because i can't use this approach for some benchmarks. Thanks, Patrizio