Re: Keys get stuck


On Wed, 2008-03-12 at 22:22 +0100, Hans-Peter Jansen wrote:
Am Mittwoch, 12. März 2008 schrieb Jiri Kosina:
On Thu, 13 Mar 2008, David Newall wrote:
The problem is that under heavy load the auto-repeat problem is real;
I've seen it as well, and it means that I've started to try to avoid
"make -j4" since that's a great way to trigger it.

I'm sure it does suck under heavy load, although I suppose you could
increase the start time. But I wonder if that is the problem this
time? Modern machines are so damned fast they actually take real
effort to load. Actually, "make -j4" doesn't sound particularly heavy.
There's huge disk i/o in a make. Plenty of scheduling opportunities.
Obviously I only know what everybody else here knows; but with so many
recent posts suggesting a scheduling fault has been introduced, I'm
expecting it to be that.

The problem became much more apparent during early -rc phase of 2.6.25
for those people that have CONFIG_GROUP_SCHED turned on. This clearly
shows that X are somehow unhappy with how kernel schedules them, but I
don't have idea how autorepeat is implemented inside X and what could be
the problem right now.

Just for the record, this problem started with openSUSE 10.2 for me, that's
a 2.6.18 thingy. I'm a heavy xterm user, where the autorepeat gets a life
of its own _occasionally_. I'm able to stop it by triggering a autorepeat
manually (typical antidot reaction).

I've seen these key repeats for years. All I ever had to do was to make
X run heavily enough in the presence of another (hefty) load that it
hits the expired array and thereby takes a serious latency hit. I
always considered key repeats under load to be X's quaint way of saying
"HEEEEELP MEEEE" ;-)

-Mike

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