On Fri, 6 Oct 2006, Christopher "Monty" Montgomery wrote:

> When my recording has gaps, but ALSA claims buffer fill never fell
> below 90%, I am filled with a developer's most righteous rage.  (It
> happens, I'll send you some of the recordings if you care.  ALSA never
> threw xrun, and it's potentially clear in retrospect why-- there was
> no way for USB to tell it slots got missed, so ALSA didn't know-- it's
> buffers were still full!).
> 
> In any case, setting a status flag on the next completion is not good
> enough; that tells you an xrun happend a long time ago.  Notification
> has to happen upon next submission.

I don't know the details of ehci-hcd, but this may well be unfeasible.  It 
would require checking the status of previous submissions every time a new 
submission is made, which might be a considerable extra load.

Alan Stern


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