From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:52011) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QUv7w-0008Nm-M7 for qemu-devel@nongnu.org; Fri, 10 Jun 2011 02:23:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QUv7v-00060X-CJ for qemu-devel@nongnu.org; Fri, 10 Jun 2011 02:23:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39219) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QUv7v-000607-0t for qemu-devel@nongnu.org; Fri, 10 Jun 2011 02:23:27 -0400 Message-ID: <4DF1B851.10609@redhat.com> Date: Fri, 10 Jun 2011 08:23:13 +0200 From: Gerd Hoffmann MIME-Version: 1.0 References: <4DEF17C1.7000805@web.de> <4DEF6FC9.8040209@redhat.com> <4DF065E9.4070605@web.de> <4DF06DED.7030604@web.de> <4DF07182.3060003@web.de> <4DF07218.7000903@web.de> <4DF0E5B0.8030704@siemens.com> <4DF0FEB4.6010109@siemens.com> In-Reply-To: <4DF0FEB4.6010109@siemens.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] assigned EHCI USB headset not working List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: =?ISO-8859-1?Q?Andr=E9_Weidemann?= , qemu-devel , "kvm@vger.kernel.org" Hi, > I've two scenarios at hand now: one involves a Windows 7 guest with > -soundhw hda, the other is my Musicpal (do you still have a firmware > image at hand?). Some Linux guest here with identical configuration like > Win7 does not show any problems in polling mode. Noteworthy difference between linux and windows 7: Windows 7 uses a pretty small ring buffer (~ one page, where 20ms sound data fit in) whereas linux uses *alot* more, 128k or so. That makes win7 guests quite sensitive to latency issues, be it in the audio subsystem or elsewhere. For example bulky screen updates with the non-threaded vnc server are enougth to cause audible glitches in audio playback. HTH, Gerd