From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:57095) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TSmpq-0008Pa-NM for qemu-devel@nongnu.org; Mon, 29 Oct 2012 06:44:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TSmpm-0004NO-NG for qemu-devel@nongnu.org; Mon, 29 Oct 2012 06:44:46 -0400 Received: from mail.profihost.ag ([85.158.179.208]:34493) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TSmpm-0004Mu-CU for qemu-devel@nongnu.org; Mon, 29 Oct 2012 06:44:42 -0400 Message-ID: <508E5E15.9060302@profihost.ag> Date: Mon, 29 Oct 2012 11:44:37 +0100 From: Stefan Priebe - Profihost AG MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] slow migration speed / strange memory usage List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel Hello list, i'm running kvm 1.2 on vanilla 3.6.3 kernel. I'm trying to understand the memory usage and the migration speed. I've a VM which does nothing else than running OpenSSH and a cron job every minute to write a small json file. When the VM is freshly started Host shows 300MB memory usage and migration speed is around 400MB/s. After time the memory usage increases in up to 3.7GB but in VM it stays incl. cache and buffers around 350MB. The migration speed is then around 25MB/s. How can this be? Is this expected? Disk cache is set to default (no cache). Greets, Stefan