Re: [Xen-devel] Re: [Xen-ia64-devel] [PATCH 0/3] IA64: add cpufreq support

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Thu, Oct 09, 2008 at 10:34:00AM +0800, Yu, Ke wrote:
> Hi Isaku,
> 
> Thanks for tesing. Please see my comments below.
> 
> Isaku Yamahata wrote:
> > Hi Yu. I tested it and have some comments.
> >
> > - When I run xenpm, xen panics
> >   It panics at 0xf40000000406ba91 =
> >   xen-unstable.hg/xen/drivers/acpi/pmstat.c:98 (addr2line told)
> >   It looks like pxpt->u.pt[pxpt->u.cur] wasn't allocated yet resulting
> >   in NULL pointer reference.
> 
> As Guanquan replied, this is a separate issue of xenpm logic, he will post 
> another patch to fix this issue.

Great.


> > - From the boot message, ondemand governor fails to load.
> >   I'm not sure this error is expected because of my hardware.
> >   I guess this error case haven't been tested and that it caused
> >   the above panic.
> 
> >From the boot message, the BIOS _PSS information is totally messed up. E.g. 
> >1048575us latency is wrong which cause ondemand driver fail to load, also 
> >1048575MHz freq is obviously not correct. There are several possible reasons 
> >of this:
> - BIOS itself is not correct
> - Dom0 ACPICA parsing logic is not correct.
> 
> If the native linux (e.g RHEL5) works, then I tend to believe this is dut to 
> the second reason. The dom0 kernel is bit old and bunch of ACPICA fixes in 
> mainline kernel are not included in dom0. In my case, I also find the _PSS 
> parsing result in my Hitachi itanium 2 box is not correct. This issue is 
> fixed after I pulling two patch from mainline kernel (changeset 677 and 678 
> in http://xenbits.xensource.com/linux-2.6.18-xen.hg)
> 
> Anyway, this is a separate issue. we will try to find other ia64 box to see 
> if this issue can be reproduced and then fixed.
> 
> BTW, is it possible to check in these patch first?

Yes, I'll try them.

I attached DSDT.dsl which I extracted from my tiger4.
It seems that wrong acpi cpuid is used.
acpi cpu id which was passed should be one of
0x00,0x01,0x04,0x05,0x08,0x09,0x0C,0x0D.
But unintended value is used.
-- 
yamahata

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