From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Brakkee Subject: USB Passthrough 1.1 performance problem... Date: Sun, 12 Dec 2010 12:47:17 +0100 Message-ID: <4D04B645.3010100@brakkee.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from cpsmtp-fia02.kpnxchange.com ([195.121.247.5]:2305 "EHLO cpsmtp-fia02.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751099Ab0LLLrU (ORCPT ); Sun, 12 Dec 2010 06:47:20 -0500 Received: from [192.168.2.24] (pelican.lan [192.168.2.24]) by brakkee.org (Postfix) with ESMTP id 4D26E72356 for ; Sun, 12 Dec 2010 12:47:17 +0100 (CET) Sender: kvm-owner@vger.kernel.org List-ID: 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. Are there some tuning parameters I can use or perhaps even kernel configuration paramters on the host to solve this? Cheers Erik Host: Motherboard Supermicro X8DTi-F, Intel Xeon L5630, 12MB OS: Opensuse 11.3 64 bit Guest: OS: Opensuse 11.3 64 bit