From: Pavel Machek <pavel@ucw.cz>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Len Brown <len.brown@intel.com>
Cc: Andreas Mohr <andi@rhlx01.fht-esslingen.de>,
vojtech@suse.cz, kernel list <linux-kernel@vger.kernel.org>
Subject: Re: strange keyboard lag after suspend testing
Date: Tue, 20 Mar 2007 17:38:26 +0100 [thread overview]
Message-ID: <20070320163826.GA7092@elf.ucw.cz> (raw)
In-Reply-To: <20070320163113.GA5740@elf.ucw.cz>
Hi!
> > >> > I was testing suspend in 2.6.21-rc4 a lot, and now... machine feels
> > >> > like someone added 50..100msec delay somewhere in keyboard
> > >> > handling. Mouse does not seem affected. /proc/interrupts seem to
> > >> > increase as they should, for both keyboard and mouse. Can someone
> > >> > reproduce it? Any ideas how to debug it?
> > >>
> > >> Probably just asking the obvious:
> > >> it's not a trivial "failed to re-configure repeat rate upon resume"
> > >> (which one could rule out by running "kbdrate" again)
> > >> but a lag in some interrupt handler or somewhere else deeper, right?
> > >
> > >No, it is not keyboard rate. Keyboard lags during normal typing,
> > >sometimes letters come in groups of two or so...
> >
> > I might start looking at embedded controller changes and switches. If
> > ACPI misbehaves that could starve keyboard controller... But you
> > said
>
> Mouse _seems_ okay, but I'm not sure if I'd notice lag there.
>
> > that mouse is OK... Hmm, what happens if you load evbug and type while
> > watching syslog. Do you observe the same delays?
>
> Hmm, seems that it only happens in X... so maybe it is some strange
> scheduling artefact?
>
> Hmm, something is wrong here:
>
> On console, I get expected 4-5 ticks a second. In x in gnome-terminal,
> I get this:
It gets weirder: I killed some tasks and now: (on unloaded system
running X, notice that top latency was ~1sec at 33:09).
root@amd:~# while true ; do echo -n . ; sleep .2; date; done
.Tue Mar 20 17:33:07 CET 2007
.Tue Mar 20 17:33:07 CET 2007
.Tue Mar 20 17:33:08 CET 2007
.Tue Mar 20 17:33:08 CET 2007
.Tue Mar 20 17:33:08 CET 2007
.Tue Mar 20 17:33:08 CET 2007
.Tue Mar 20 17:33:09 CET 2007
.Tue Mar 20 17:33:10 CET 2007
.Tue Mar 20 17:33:10 CET 2007
.Tue Mar 20 17:33:10 CET 2007
.Tue Mar 20 17:33:10 CET 2007
.Tue Mar 20 17:33:10 CET 2007
.Tue Mar 20 17:33:11 CET 2007
.Tue Mar 20 17:33:11 CET 2007
.Tue Mar 20 17:33:11 CET 2007
.Tue Mar 20 17:33:12 CET 2007
.Tue Mar 20 17:33:12 CET 2007
As soon as I load the cpu up with while1, machine starts to behave.
When I turn on bluetooth (USB), ACPI can no longer use C3, and machine
starts to behave. Hmm?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2007-03-20 16:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-20 15:33 strange keyboard lag after suspend testing Pavel Machek
2007-03-20 16:00 ` Andreas Mohr
2007-03-20 16:03 ` Pavel Machek
2007-03-20 16:09 ` Dmitry Torokhov
2007-03-20 16:31 ` Pavel Machek
2007-03-20 16:38 ` Pavel Machek [this message]
2007-03-20 21:56 ` Rafael J. Wysocki
2007-03-21 20:12 ` Luca Tettamanti
2007-03-21 22:22 ` Pavel Machek
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