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Re: [Qemu-devel] husb: out of buffers for iso stream
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] husb: out of buffers for iso stream |
Date: |
Wed, 30 Nov 2011 16:45:30 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111104 Red Hat/3.1.16-2.el6_1 Thunderbird/3.1.16 |
On 11/30/11 14:52, Stefan Hajnoczi wrote:
> On Thu, Nov 24, 2011 at 9:04 AM, Stefan Hajnoczi <address@hidden> wrote:
>> On Wed, Nov 23, 2011 at 4:01 PM, Gerd Hoffmann <address@hidden> wrote:
>>> For starter try a higher number of buffers (isobufs property).
>>> Also make sure you enable the vnc thread (unless you have already).
>
> Tested with vnc thread and isobufs=32. This time the stderr output is:
> USBDEVFS_SUBMITURB: File too large [several times, followed by...]
> husb: out of buffers for iso stream [many times]
"File too large" could mean that there are too many bufs submitted, try
making isobufs smaller.
> I can still ping the guest and issue QEMU monitor commands while the
> display and audio appear to be frozen. Moving the mouse makes it the
> audio responsive again.
Display frozen too? Hmm. Totaly frozen? Or is this input level meter
stop changing?
> Next I disabled USB tablet in case there is an interaction between USB
> passthrough and the emulated tablet. The audio still gets stuck but
> moving the mouse no longer helps. So the mouse is just a distraction,
> iso buffers are simply not working and USB table emulation somehow
> "kicks" guest USB back into action.
Is the usb sound device usb 1.1 or usb 2.0? Works it ok on the host?
> Then I tested playback and capture separately in case it was specific
> to just one data direction, but both playback and capture freeze in
> the same way. (Playback means the guest is handing filled out iso
> buffers to the device. Capture means the guest is asking the device
> to fill in iso buffers.)
>
> Any suggestions where to go from here?
For starters try enabling usb-host trace points ...
cheers,
Gerd