Re: [Xen-devel] A clocksource question

[Tobias Geiger <tobias.geiger@xxxxxxxxx>]

Am Freitag 12 März 2010 22:24:54 schrieb Jeremy Fitzhardinge:
> On 03/12/2010 11:02 AM, Joanna Rutkowska wrote:
> > Today I upgraded to xen 3.4.3-rc3 and tried the 2.6.32 kernel (the
> > Micheal Young's one) -- the same problem :(
> 
> Good, in a way.  I can't think of a reason it would change from .31 -> .32.
> 
> Experiment of the moment: does changing the clocksource in
> /sys/devices/system/clocksource/clocksource0/current_clocksource reset
> the problem after killing the other domains?  Ie, switch it from
> xen->jiffies->xen for a while.
> 
kbpc2:~# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
xen
kbpc2:~# cat 
/sys/devices/system/clocksource/clocksource0/available_clocksource
xen
kbpc2:~# echo "jiffies" 
>/sys/devices/system/clocksource/clocksource0/current_clocksource
kbpc2:~# dmesg  | tail -1
[ 7898.642404] Override clocksource jiffies is not HRT compatible. Cannot 
switch 
while in HRT/NOHZ mode
kbpc2:~#

Seems like it's not possible to switch to jiffies - however:
kbpc2:~# zcat /proc/config.gz | grep NO_HZ
# CONFIG_NO_HZ is not set

but CONFIG_SCHED_HRTICK=y

Greetings
Tobias


> Thanks,
>      J
> 
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