lkml.org 
[lkml]   [2007]   [Sep]   [3]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateMon, 3 Sep 2007 03:56:44 +0000
FromPavel Machek <>
Subjecthighres timers break cpu hotplug in 2.6.23-rc5 [was Re: cpu hotplug support broken in 2.6.23-rc3]
Hi!

> > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or
> > so cycles at one point.
> 
> Mine still survives with this ... with sleep 1 ...
> 
> # for((i=0; i<100; i++)); do echo $i; echo $((i % 2))
> >/sys/devices/system/cpu/cpu1/online; sleep 1; done
> 
> and this as well ... without sleep ...
> 
> # for((i=0; i<100; i++)); do echo $i; echo $((i % 2))
> >/sys/devices/system/cpu/cpu1/online; done
> 
> I'm on reiserfs. gcc 3.4.5. Config sent to you seperately so as not to
> cloud lkml. If anyone wants the config, please let me know. Is mime
> "attachment" acceptable now on lkml?

It gets weirder. With "nohz=off" on commandline, I have to press any
key (generate interrupt?) for echo 1  > online to finish. 2.6.23-rc5
kernel... but hotplug/unplug works reliably now.
With nohz=off highres=off I can unplug/replug cpus as much as I
want... running in tight loop now.
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
-
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: 2007-09-03 10:09    [from the cache]
©2003-2008