On 11/30/11 14:52, Stefan Hajnoczi wrote: > On Thu, Nov 24, 2011 at 9:04 AM, Stefan Hajnoczi <stefa...@gmail.com> wrote: >> On Wed, Nov 23, 2011 at 4:01 PM, Gerd Hoffmann <kra...@redhat.com> 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
