Fernando Lopez-Lezcano wrote:
On Wed, 2005-10-12 at 15:08 -0700, George Anzinger wrote:
Steven Rostedt wrote:
On Wed, 12 Oct 2005, Ingo Molnar wrote:
i'm not sure latency traces will uncover anything useful for this bug.
Your problems could be timer issues: timers going off too fast cause
high keyboard repeat rates, and the same goes for the screensaver. Does
'sleep 1' work as expected, or is that timing out in an "accelerated"
way too?
I usually recommend doing a 'sleep 10'. It really shows you if things are
wrong. If a sleep 1 returns 2 seconds, or 0.5 seconds later it may not be
detected. But a sleep 10 returning 20 seconds or 5 seconds later is
obvious.
Or maybe:
'time sleep 10'
Lets the machine time it.
My first thought was "this can't work" as I imagined the same timing
services would be used and you would get always 10 secs or so...
Ingo: I tried with PREEMPT_RCU=y and it made no difference.
When the system starts to misbehave I tried 'time sleep 10' and got
really wild results:
# time sleep 10
real 0m10.007s
user 0m0.001s
sys 0m0.003s
# time sleep 10
real 0m10.006s
user 0m0.000s
sys 0m0.003s
# time sleep 10
[the return key "autorepeated" here :-]
real 0m10.006s
user 0m0.001s
sys 0m0.003s
#
#
#
# time sleep 10
real 0m0.016s
user 0m0.002s
sys 0m0.001s
[yes I really got the prompt back that fast!]
#
#
# time sleep 10
real 73m18.087s
user 0m0.000s
sys 0m0.003s
[this last one was also very fast, it did not take 73 minutes...]
Uh... this implies that your system clock is not keeping very good time. Is that so? Try:
date
time sleep 10
date
~
--
George Anzinger [email protected]
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
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