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From: | Hans de Goede |
Subject: | Re: [Qemu-devel] EHCI USB regression in 1.2.0 - ehci_state_fetchqtd() asserting |
Date: | Mon, 08 Oct 2012 13:27:28 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 |
Hi, On 10/02/2012 05:26 PM, Shawn Starr wrote:
On Monday, September 24, 2012 10:38:57 AM Shawn Starr wrote:On Monday, September 24, 2012 04:36:15 PM Hans de Goede wrote:Hi,Hello, Reopening this issue with usb-host stalling now ehci warning: guest updated active QH USBDEVFS_DISCARDURB: Invalid argument USBDEVFS_DISCARDURB: Invalid argument husb: leaking iso urbs because of discard failure Now with qemu-XXX-1.2.0-12.fc18.x86_64 if I have webcam open, it will stall and not resume. This is with usb-host directly. Shall I enable debugging again?
Hmm, this likely is caused by too high latencies in your system, which are caused in turn I believe by you running an F-18 kernel which has various debugging options enabled inside the kernel which can cause significant latencies. I've spend 1.5 days tracing this very same issue down in the past. So please first of all make sure that you're running a kernel without debugging options enabled, either the latest F-18 build from koji: http://koji.fedoraproject.org/koji/buildinfo?buildID=358570 or an F-17 kernel, almost all the F-18 "rc" kernels have debugging enabled and thus cause significant latency issues. If you can reproduce this with a kernel without the debugging options, then we can investigate this further. Regards, Hans
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