Avi Kivity wrote:
On 06/17/2009 11:38 AM, Michael Tokarev wrote:
After seeing words from Avi about that smp guests
are ok now, I descided to try. And immediately
got a few questions.
Running on a Phenom 9750 machine (PhenomI), AMD780G
chipset. Host is 2.6.29 x86-64, qemu-kvm 0.10.5,
guests are linux with kvm paravirt bits enabled, also
dynticks (on both host and guest).
When booting a 2-CPU guest, I see in dmesg:
PM-Timer running at invalid rate: 200% of normal - aborting.
and indeed, in available_clocksource there's no pmtimer.
Should I be concerned? It does not look healthy.
It's a bug, please post guest details (kernel version, bitness).
The guest kernel is also 2.6.29[.5], but this time it's x86-32
(compiled for P4). kvm userspace is also 32bits (historical) --
only host kernel is 64bit for now. I'll try to do some more
experiments later today on a test machine (this is a production
box) -- "hopefully" that same issue will occur on another
machine :)
Copying Marcelo.
Some time later, I see stuff like:
hrtimer: interrupt too slow, forcing clock min delta to 47210997 ns
Which reminds me issues I had with broken hpet (time goes
back-n-forth with similar messages shown in dmesg, but
about hpet not hrtimer). Also does not look healthy.
I haven't seen either of the two messages above on any of
single-processor guests so far, at least with recent kernels
and kvm userspace, only on smp (2 cpu for now).
Please also post host /proc/cpuifo.
HOST cpuinfo (only for 4th core, other cores are similar):
processor : 3
vendor_id : AuthenticAMD
cpu family : 16
model : 2
model name : AMD Phenom(tm) 9750 Quad-Core Processor
stepping : 3
cpu MHz : 1200.000
(yes ondemand cpufreq is in effect - nominal frequency is 2400.
I had no issues with cpufreq on this box so far, including all
the guests).
cache size : 512 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 3
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc pni monitor cx16
lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch
osvw ibs
bogomips : 4812.67
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
cpuinfo on GUEST (also for only one CPU):
processor : 1
vendor_id : AuthenticAMD
cpu family : 6
model : 2
model name : QEMU Virtual CPU version 0.10.5
stepping : 3
cpu MHz : 2405.894
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush mmx fxsr sse sse2 syscall lm pni hypervisor
bogomips : 4811.78
clflush size : 64
power management:
Thanks!
/mjt
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