Re: USB 2.0 device has 8ms latency

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On Thu, 22 Oct 2015, John Tapsell wrote:

> I had a look at the windows driver, and found that it is implemented
> in pretty much exactly the same way as the linux driver, but it
> operates at twice the speed.  And that's for a user-space USB driver.
> 
> Any ideas why?

Windows and Linux allocate bandwidth for interrupt endpoints at 
different times.  The scheme Windows uses involves less overhead, but 
it also makes less total bandwidth available.

I don't know if that's the reason for the difference, but it might be.

Alan Stern

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