From: Gerd Hoffmann <kraxel@redhat.com>
To: Erik Brakkee <erik@brakkee.org>
Cc: KVM mailing list <kvm@vger.kernel.org>
Subject: Re: USB Passthrough 1.1 performance problem...
Date: Mon, 13 Dec 2010 11:36:27 +0100 [thread overview]
Message-ID: <4D05F72B.30207@redhat.com> (raw)
In-Reply-To: <4D04B645.3010100@brakkee.org>
Hi,
> I am using a tv card in a VM and get jerky video.As I understand it, the
> VM is using USB 1.1. However, when I set the USB controller in the BIOS
> of my server to Fullspeed (12 Mbit/s) which is the USB 1.1 speed I am
> able to get perfect results on the host but still on the guest the video
> is jerky.
There is a patch series from Hans de Goede on qemu-devel which adds
buffering for isochronous usb transfers to the usb passthrough code.
Certainly worth a try.
cheers,
Gerd
prev parent reply other threads:[~2010-12-13 10:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-12 11:47 USB Passthrough 1.1 performance problem Erik Brakkee
2010-12-12 20:59 ` Erik Brakkee
2010-12-12 22:16 ` Jan Kiszka
2010-12-12 22:31 ` Erik Brakkee
2010-12-13 8:25 ` Alexander Graf
2010-12-14 10:02 ` Avi Kivity
2010-12-14 10:11 ` Alexander Graf
2010-12-31 17:00 ` Kevin O'Connor
2010-12-13 23:27 ` Jan Kiszka
2010-12-13 23:50 ` Kenni Lund
[not found] ` <3047113345.976756218@brakkee.org>
2010-12-14 0:47 ` Kenni Lund
[not found] ` <5085473063.976781602@brakkee.org>
2010-12-14 11:55 ` Kenni Lund
2010-12-14 12:05 ` Daniel P. Berrange
2010-12-14 21:47 ` Erik Brakkee
2010-12-14 23:44 ` Kenni Lund
2010-12-16 16:23 ` Erik Brakkee
2010-12-16 21:46 ` Erik Brakkee
2010-12-24 18:19 ` Erik Brakkee
2010-12-13 10:36 ` Gerd Hoffmann [this message]
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