From owner-freebsd-emulation@FreeBSD.ORG Sat Dec 6 22:32:58 2008 Return-Path: Delivered-To: freebsd-emulation@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2B93F1065677 for ; Sat, 6 Dec 2008 22:32:58 +0000 (UTC) (envelope-from nox@saturn.kn-bremen.de) Received: from gwyn.kn-bremen.de (gwyn.kn-bremen.de [212.63.36.242]) by mx1.freebsd.org (Postfix) with ESMTP id 823798FC1D for ; Sat, 6 Dec 2008 22:32:57 +0000 (UTC) (envelope-from nox@saturn.kn-bremen.de) Received: by gwyn.kn-bremen.de (Postfix, from userid 10) id 6D0FE192111; Sat, 6 Dec 2008 23:32:56 +0100 (CET) Received: from saturn.kn-bremen.de (noident@localhost [127.0.0.1]) by saturn.kn-bremen.de (8.14.2/8.13.8) with ESMTP id mB6MVeNI038131; Sat, 6 Dec 2008 23:31:40 +0100 (CET) (envelope-from nox@saturn.kn-bremen.de) Received: (from nox@localhost) by saturn.kn-bremen.de (8.14.2/8.13.6/Submit) id mB6MVeat038130; Sat, 6 Dec 2008 23:31:40 +0100 (CET) (envelope-from nox) From: Juergen Lock Date: Sat, 6 Dec 2008 23:31:40 +0100 To: qemu-devel@nongnu.org, freebsd-emulation@FreeBSD.org Message-ID: <20081206223140.GA37972@saturn.kn-bremen.de> Mail-Followup-To: qemu-devel@nongnu.org, freebsd-emulation@FreeBSD.org References: <20081206220906.GA34210@saturn.kn-bremen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081206220906.GA34210@saturn.kn-bremen.de> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Subject: usb slowness again (was: testing qemu svn r5890 on FreeBSD - virtio, and a patch enabling -clock dynticks) X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Dec 2008 22:32:58 -0000 On Sat, Dec 06, 2008 at 11:09:06PM +0100, Juergen Lock wrote: > Hi! > > Jung-uk Kim sent me a patch to enable -clock dynticks on FreeBSD hosts > (the configure check is mine, only FreeBSD >= 7.x has posix timers that > this uses), I'll append it below. > > This is the experimental qemu-devel port update I used: > http://people.freebsd.org/~nox/qemu/qemu-devel-20081206.patch > As already mentioned I had to add a missing `#include ' > (files/patch-qemu-common.h), as also posted here: > http://lists.gnu.org/archive/html/qemu-devel/2008-12/msg00216.html > > I only had one (type of) guest that actually had virtio drivers (three > versions of sidux isos), and the speed difference between virtio-blk and > scsi was small. (I tested dd bs=64k count=500 /dev/null and > similar with a raw image, both scsi and virtio were always faster than ide.) > I noted tho that even virtio there was not half as fast as ide (and scsi) > on KNOPPIX_V5.3.1DVD-2008-03-26-EN.iso, so either overhead has increased > greatly from 2.6.24.4 to 2.6.26, or this has something to do with > the sidux kernel using CONFIG_NO_HZ and the Knoppix one (apparently) not > and qemu (possibly, I also suspected that with the usb slowness) not > handling CONFIG_NO_HZ guests too well. [...] Well I just tried -usb -usbdevice net:vlan=1 -net user,vlan=1 with the Knoppix iso and got the same thruput (< 40 K/s) for wget on a local file than I got with sidux. So its probably not CONFIG_NO_HZ, at least not the usb slowness. Just thought I'd mention... Juergen