From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1G4wP6-0006yM-EP for qemu-devel@nongnu.org; Mon, 24 Jul 2006 05:07:08 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1G4wP1-0006vD-EB for qemu-devel@nongnu.org; Mon, 24 Jul 2006 05:07:07 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1G4wP1-0006v2-92 for qemu-devel@nongnu.org; Mon, 24 Jul 2006 05:07:03 -0400 Received: from [203.190.192.17] (helo=wasp.net.au) by monty-python.gnu.org with esmtp (Exim 4.52) id 1G4wQ4-00016y-9s for qemu-devel@nongnu.org; Mon, 24 Jul 2006 05:08:08 -0400 Message-ID: <44C48DAD.9010301@wasp.net.au> Date: Mon, 24 Jul 2006 13:06:53 +0400 From: Brad Campbell MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Performance issues with -usb 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 G'day all, Just a diary note or similar. I've been playing with skype under win2k under qemu with -kernel-kqemu and the alsa audio driver. 1st. The user-net driver appears to be a problem for skype but the tap driver works nicely. 2nd. I was having awful problems with the audio. The app was reporting failures of either the dac or adc apparently randomly and when it did work it was rather intermittent. I noticed that with -usb -usbdevice tablet that qemu sits at about 20% cpu usage (on this machine which is a Pentium-M 1.2G which idles at 600Mhz) whereas without -usb qemu idles completely. In addition to this, without -usb.. skype works almost perfectly. There is the occasional audio glitch (as you would expect) but it does everything it is supposed to do quite nicely. I'm using all the latest gear. A 2.6.18-rc2 host kernel, Latest Qemu CVS and the -pre9 kernel accelerator. Win2k SP4 as a guest with either 256 or 384M of ram depending on my mood :) I'm going to have a dig around in the USB stuff when I get the chance, but it's more of a fyi and for google that I post it here. Brad -- "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." -- Douglas Adams