Messages in this thread | | | Date | Fri, 08 Jul 2005 15:27:50 -0500 | From | "K.R. Foley" <> | Subject | Re: Real-Time Preemption -RT-V0.7.51-17 - Keyboard Problems |
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Doug Maxey wrote: > On Fri, 08 Jul 2005 21:13:26 +0200, Ingo Molnar wrote: > >>* K.R. Foley <kr@cybsft.com> wrote: >> >> >>>Ingo, >>> >>>I have an issue with keys VERY SPORADICALLY repeating, SOMETIMES, when >>>running the RT patches. The problem manifests itself as if the key >>>were stuck but happens far too quickly for that to be the case. I >>>realize that the statements above are far from scientific, but I can't >>>seem to narrow it down further. 2.6.12 doesn't seem to have the >>>problem at all, only when running the RT patches. It SEEMS to have >>>gotten worse lately. I am attaching my config as well as the output >>>from lspci. >>> >>>Adjusting the delay in the keyboard repeat seems to help. Any ideas? > > > Is the keyboard standard (PS2) or USB? Did not see the detail.
Sorry. It is PS2.
> > >>hm. Would be nice to somehow find a condition that triggers it. One >>possibility is that something else is starving the keyboard handling >>path. Right now it's handled via workqueues, which live in keventd. Do >>things improve if you chrt keventd up to prio 99? Also i'd chrt the >>keyboard IRQ thread up to prio 99 too. >> >>the other possibility is some IRQ handling bug - those are usually >>specific to the IRQ controller, so try turning off (or on) the IO-APIC >>[if the box has an IO-APIC], does that change anything? > > > FWIW, I have seen this issue under USB, off and on since about 2.6.9. > Never have dug into it, was always simpler to just unplug and re-plug > the keyboard. Of course, this predates RT. > > ++doug > >
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