On Tue, 2008-01-08 at 01:30 +0000, Paul Brook wrote: > > -The host kernel was configured with dynamic tick & hi-res timers, to > > allow the desired timer resolution. USB 2.0 microframe is 125usec. >
It still works even without accurate timing demands. Only isochronous mode will have problems and it is not yet supported for ehci. > Requiring a 8kHz timer is a non-starter. > > The 100kHz "retry" timer is even more bogus. > > Qemu isn't capable of this kind of realtime response. You need to figure out > an implementation that doesn't require extremely fine grained timers. In > paractice you're unlikely to get better than 10ms timer resolution, and 100ms > latency isn't that uncommon. > > Paul Latest Linux host compiled HR_TIMER and DYN_TICK can give pretty good accuracy, surely it can provide 1khz and probably even 8khz Dor
