[Xen-users] Re: Status of frequency scaling

[Stephan Seitz <nur-ab-sal@xxxxxx>]

On Mon, Apr 30, 2007 at 11:47:03AM +0200, Petersson, Mats wrote:
> Well, the current official status is "it doesn't work at all". 
Hm, okay.

> There are several problems, some of which are relatively easy to fix and
> some that aren't:
> 2. There is no power-management policy for the entire system, so dom0
> usage will determine the entire system's performance. This doesn't work
> very well, as Dom0 isn't supposed to be heavily loaded, DomU's are. 
Understandable. In my case, Dom0 would be by Desktop system while DomU 
would be the firewall (for now a different host), so I could live with 
this restriction.
> 3. Guest may need to be informed of the frequency change. Some kernels
> may not appreciate that the CPU frequency is chaning "without it's
> knowledge". [This is probably not a big problem on modern OS's, but some
> older ones may be very un-co-operative on this account]. 
Ah yes, I remember, that a Solaris system within VMware server didnât 
like the frequency changes of the Linux host.
I donât have any problems with XP within VMware server at my notebook.

> > I have an AMD64. powerno-k8 works find with non-XEN kernels, but with 
> > XEN-kernels I get the error:
> > powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3400+ 
> > processors (version 2.00.00)
> > powernow-k8: BIOS error - no PSB or ACPI _PSS objects
> This is strange - as far as I can remember, I had powernow working on my
> machine not so long ago (3.0.4 or so) with only the traps.c patched to
> allow writing of the FID/VID controls registers. 
Could you send me the patch for traps.c? I would like to try it.

> You're doing this in Dom0 I take it? I don't expect this to work in 
> DomU's.
Yes, of course in Dom0. For now I donât have any DomU created.

Thanks for your answers!

Shade and sweet water!

        Stephan

--
| Stephan Seitz                    E-Mail: Nur-Ab-Sal@xxxxxx |
| PGP Public Keys: http://fsing.rootsland.net/~stse/pgp.html |

Attachment: signature.asc
Description: Digital signature

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users