lkml.org 
[lkml]   [2005]   [Jul]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Real-Time Preemption -RT-V0.7.51-17 - Keyboard Problems
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?
>
>
> 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.

I would like very much to come up with a condition that causes it.
Unfortunately, the only event that I know of that is associated with
this typing. :-) There does not seem to be a method to the madness.

As for bumping the priorities, I tried them all, at least the ones
mentioned above. I also tried the timer just for grins, after changing
the keyboard repeat delay seemed to help a bit. None of them seemed to
help, at least not for an extended period of time.

>
> 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?
>

You may be on to something here. Booting with noapic SEEMS to help.

> Ingo
>


--
kr
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-07-08 23:36    [W:0.128 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site