Hi,
I recently posted the attached mail below to Keir Fraser.
I got an answer:
---- snip ----
The 'stale' frequency info in domU is harmless
---- snap ----
My question is, why the cpu frequency in dom0 ist not jumping to 2GHz,
if the cpu usage inside a domU is very high?
Second question: If in dom0, which value is showing the correct
information: the frequency or the bogomips? Normally the latter would
change, if the frequency changes. Not so in dom0? Why?
Kind regards
Christian
--- snip attached mail ---
Today I have recognized something interestin:
If I boot my Xen-box @ 2GHz, starting 2 DomUs at boottime, I can see
that the cpuinfo is showing:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 4
model name : AMD Athlon(tm) 64 Processor 3200+
stepping : 8
cpu MHz : 2019.560
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu tsc msr pae mce cx8 apic mca cmov pat pse36
clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow ts fid vid ttp
bogomips : 4047.21
inside the DomUs, even the CPU has switched the frequency back to 800MHz.
If I do something like
while true; do ls -l | md5sum; done
in Dom0, the CPU frequency jumps @ 2GHz, while if doing the same inside
a DomU, the CPU still is @ 800MHz.
Now I thought, I would have to compile in cpufreq support into the DomU
kernel, but if I remove the "privileged" host option, the whole ACPI
powermanagement menu is away.
So, what can I change, to get this working correctly?
Maybe noone has tried something like this, but I think this is a little
bug, isn´t it?
There is something else: Normally, when the CPU frequency is @ 800 MHz,
the Bogomips are much less than 4000. But look at this:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 4
model name : AMD Athlon(tm) 64 Processor 3200+
stepping : 8
cpu MHz : 800.000
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36
clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow ts fid vid ttp
bogomips : 4021.05
If you think, I should post this to the xen-devel list, I first would
have to subscribe again.
But thanks in advance. Maybe you have some ideas on that.
---- snap ----
--
Tel.: 0641-2097252, Mobil: 0171-3611230
PGP: http://www.roessner-net.com/0x6B929997.asc
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