Re: [Xen-devel] Build XEN 3.2 with cpufreq Support

[Ralf Schenk <rs@xxxxxxxxxx>]

Langsdorf, Mark schrieb:
>> Does anybody know how to build and use cpufreq support that 
>> should be in 3.2 since -unstable time ?
> 
> Build dom0 with cpufreq support.  Pass "cpufreq=dom0-kernel"
> on the Xen command line.  ondemand support should work
> automatically from there, or you can choose one of the
> other governors.
> 
> -Mark Langsdorf
> Operating System Research Center
> AMD
> 

Thanks for your support,

ondemand frequency is working in dom0 now (on M2NBP-VM CSM Mainboard and
Athlon 64 X2 5000+ CPU).

If I run cpu-intensive tasks (mprime) in a domU frequency switches to max
2.6Ghz.

Thats great and a new feature - but I get these warnings in the syslog of my
domU that were reported anywhere on the mailinglist around October:

Jan 19 00:11:09 server kernel: printk: 14 messages suppressed.
Jan 19 00:11:09 server kernel: Timer ISR/0: Time went backwards:
delta=-123862858 delta_cpu=-123862858 shadow=
2993571302800 off=705014593 processed=2994400167600 cpu_processed=2994400167600
Jan 19 00:11:09 server kernel:  0: 2994400167600
Jan 19 00:11:09 server kernel:  1: 2994213786880
Jan 19 00:11:09 server kernel: Timer ISR/1: Time went backwards:
delta=-50043804 delta_cpu=136336916 shadow=29
93571302800 off=778821372 processed=2994400167600 cpu_processed=2994213786880
Jan 19 00:11:09 server kernel:  0: 2994400167600
Jan 19 00:11:09 server kernel:  1: 2994213786880
Jan 19 00:11:09 server kernel: Timer ISR/1: Time went backwards:
delta=-70033718 delta_cpu=66347002 shadow=299
3571302800 off=838831281 processed=2994480167600 cpu_processed=2994343786880
Jan 19 00:11:09 server kernel:  0: 2994480167600
Jan 19 00:11:09 server kernel:  1: 2994343786880

This happens also if I switch manually with cpufreq-set -f 2.60GHz of
cpufrequtils.

I can't see any problems except the warnings...

Bye
-- 
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