From: Gerd Hoffmann <kraxel@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: malc <av1474@comtv.ru>,
"André Weidemann" <Andre.Weidemann@web.de>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: assigned EHCI USB headset not working
Date: Fri, 10 Jun 2011 08:23:13 +0200 [thread overview]
Message-ID: <4DF1B851.10609@redhat.com> (raw)
In-Reply-To: <4DF0FEB4.6010109@siemens.com>
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
prev parent reply other threads:[~2011-06-10 6:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-08 6:33 assigned EHCI USB headset not working André Weidemann
2011-06-08 12:49 ` Gerd Hoffmann
2011-06-09 6:19 ` André Weidemann
2011-06-09 6:53 ` Jan Kiszka
2011-06-09 7:08 ` André Weidemann
2011-06-09 7:11 ` Jan Kiszka
2011-06-09 15:13 ` malc
2011-06-09 15:24 ` Jan Kiszka
2011-06-09 16:09 ` malc
2011-06-09 17:11 ` Jan Kiszka
2011-06-10 6:23 ` Gerd Hoffmann [this message]
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