[Bug 43125] Device reports coming in too fast

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=43125

--- Comment #5 from seirra blake <general at sarifria.x10.bz> ---
(In reply to Kai Krakow from comment #4)
> (In reply to seirra blake from comment #3)
> > really the impression i get from what you're saying is that there are simply
> > just too many reports? so perhaps it needs to negotiate that 'sweet spot'
> > where it doesn't drop any? perhaps some saved values for known gamepads with
> > a fallback option for unknown ones where it will automatically work it out?
> > (then perhaps prompt the user to send in a report with the values)
> 
> I've got feedback from the original creator of the code.
> 
> The explanation for my instance of the error reports seems to come from a
> very high axis sampling rate of the xbox controllers.
> 
> So yes, there are too many reports and the driver design is a bit difficult
> here. Problem is to dequeue a report fast enough. But some of the called
> routines have a little overhead and everything is single-threaded. If you
> need to feed more than one reader with device reports, the overhead just
> grows. When the next HID report comes in, it needs to overwrite the buffer.
> If you would implement a queue here, your controller inputs would drift in
> latency which may not be wanted.
> 
> But I'll be looking into it with helper of the author. Let's see if we can
> come up with an improved solution.
> 
> @Nikolay:
> Your issue seems to be a bit different although the same (not yet invented)
> fix may solve it. Maybe it comes from the gaming mouse. If it has a high
> sampling rate, too, it may be the same issue. OTOH, I'm not sure if the
> mouse should be presented on winebus.sys through SDL...
> 
> BTW: Also Gentoo here... ;-)

AFAIK wine's implementation only uses it for gamepads? however perhaps that
driver has some behavioral quirks.

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