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SubjectRe: Real-Time Preemption -RT-V0.7.51-17 - Keyboard Problems
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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kr
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