RE: [Xen-devel] No C-States any longer...

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Carsten Schiers
> Sent: Sunday, June 05, 2011 12:19 AM
> 
> after my move to Xen 4.1.0 and Debian 2.6.32-5-xen-amd64 pvops Dom0.
> Seems to be a problem with ACPI.
> Can it be a BIOS problem (although it worked up to now) or is this not
> implemented?

to verify BIOS problem, you could run a native Linux to verify.

> 
> Thanks & BR, Carsten.
> 
> Some infos:
> 
> xm dmesg after xm debug-key c:
> --------------------------------
> (XEN) 'c' pressed -> printing ACPI Cx structures
> 
> xenpm get-cpuidle-states 0
> --------------------------
> Max C-state: C7
> 
> cpu id               : 0
> total C-states       : 0
> idle time(ms)        : 0
> pc3                  : [00000000000000000018 ms]
> pc6                  : [00000000000000004294 ms]
> pc7                  : [00000000000140733193 ms]
> cc3                  : [00000000000000000000 ms]
> cc6                  : [00000000000000000006 ms]

This looks strange. At least C1 should be available. You may check Xen/dom0
log to see any error there, or manually add some printk in set_cx_pminfo to
see any error there.

Thanks
Kevin

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