Re: Build XEN 3.2 with cpufreq Support

[Ralf Schenk <rs@databay.de>]

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
-- 
__________________________________________________

Ralf Schenk
fon (02 41) 9 91 21-0
fax (02 41) 9 91 21-59
rs@databay.de

Databay AG
Hüttenstraße 7
D-52068 Aachen
www.databay.de

Vorstand: Jens Conze, Ralf Schenk, Aresch Yavari
Aufsichtsratvorsitzender: Ansgar Vögeli

Sitz/Amtsgericht Aachen
HRB:8437
USt-IdNr.: DE 210844202

Databay - einfach machen.

_________________________________________________

Diese E-Mail und etwa angehängte Dateien enthalten vertrauliche
Informationen und sind ausschließlich für den Adressaten bestimmt.
Sollten Sie irrtümlich diese E-Mail erhalten haben, bitten wir Sie,
uns darüber unter info@databay.de zu informieren und die E-Mail
aus Ihrem System zu löschen.

This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
info@databay.de. If you are not the named recipient, you should return
this message and delete it from your system.