From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1V9fLv-00014O-M4 for user-mode-linux-devel@lists.sourceforge.net; Wed, 14 Aug 2013 17:59:23 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by sog-mx-3.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1V9fLt-0000cs-ES for user-mode-linux-devel@lists.sourceforge.net; Wed, 14 Aug 2013 17:59:22 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r7EHxFZ8007983 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 14 Aug 2013 13:59:15 -0400 Received: from localhost (vpn1-4-41.ams2.redhat.com [10.36.4.41]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r7EHxE7j028614 for ; Wed, 14 Aug 2013 13:59:14 -0400 Date: Wed, 14 Aug 2013 18:59:11 +0100 From: "Richard W.M. Jones" Message-ID: <20130814175911.GG10864@redhat.com> References: <20130809204355.GA10864@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20130809204355.GA10864@redhat.com> List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net Subject: [uml-devel] Performance tests (was: Using UML in libguestfs) To: user-mode-linux-devel@lists.sourceforge.net I performed some benchmarks against KVM: http://rwmj.wordpress.com/2013/08/14/performance-of-user-mode-linux-as-a-libguestfs-backend/#content Notes for those that don't want to read all that, there are at least two bugs I found: (1) fsync /dev/ubda (in the guest) is not honoured by the user-mode linux process. It should do an fsync on the corresponding backing file. (2) The ssl=... serial port is really slow, at least 10 times slower than virtio-serial which is the equivalent KVM feature. libguestfs is chatty over the serial port, and so this has a significant knock-on impact all over the place. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel