Messages in this thread | | | Date | Fri, 16 May 2003 13:20:52 -0400 (EDT) | From | Alan Stern <> | Subject | Re: Test Patch: 2.5.69 Interrupt Latency |
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On 16 May 2003, Paul Fulghum wrote:
> Moving the wait out of the ISR and doing the wakeup > only for RD on non-OC ports are winners. > > I can't comment on the 1 second grace period. Was that > in response to this investigation, or have you actually > seen false RD indications due to noise?
Well, I have actually seen false indications. Whether they are due to noise is open to debate. Since they occur just at the time when I turn the power to my USB peripheral on or off, that's my best guess. It might even turn out that power on/off generates a temporary OC condition, so fixing that might render the grace period unnecessary. I haven't had a chance try it yet.
> There is also the more trivial matter of removing the > unnecessary setting of the FGR bit on wakeup.
Yes. That can be done in any case.
> I'll check that the global RD interrupt does not > keep repeating after a false RD by an OC port.
Good.
> So I suggest you build a patch that does all of > the above (with the grace period at your discretion). > Then we can both test it, and you can submit it > for actual inclusion.
I will. Probably won't be ready until some time next week.
Alan Stern
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