Gleb Natapov wrote:
On Wed, Jul 21, 2010 at 01:09:06PM +0300, Harri Olin wrote:
Gleb Natapov wrote:
Frozen kvm_stat can be seen here; when I grabbed this, windows did
not answer to ping.
stats: http://mizar.remote.agasha.com/k/kvm/kvm_stat_hang.txt
trace: http://mizar.remote.agasha.com/k/kvm/kvm_trace_hang.txt
Not much happens here. Windows gets timer irqs at 1024Hz rate and
process them. What is your host kernel? Does it have hi-res timers?
Host kernel is vanilla 2.6.33.1 from kernel.org. Should have hi-res
timers enabled.
full dmesg at: http://mizar.remote.agasha.com/k/kvm/dmesg.txt
[ 0.415380] HPET: 4 timers in total, 0 timers will be used for
per-cpu timer
[ 0.416004] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0
[ 0.416263] hpet0: 4 comparators, 64-bit 14.318180 MHz counter
Here's another frozen state stat dump; when I got this windows did
answer to ping but was otherwise unresponsive:
stats: http://mizar.remote.agasha.com/k/kvm/kvm_stat_2_log.txt
trace: http://mizar.remote.agasha.com/k/kvm/kvm_trace_2.txt
On both times irq_exits go to 10000 but irq_injections stay at
around 4600. On both times qemu process was at 100% cpu load.
irq_exits are exits due to host interrupt. What "cat /proc/interrupts"
show? Which counter grows at this rate there (or 1/4 of the rate but for
each host cpu).
I have to check that next time when freeze happens.
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 1144 1056 1081 1072 IO-APIC-edge timer
1: 324 329 348 329 IO-APIC-edge i8042
3: 1 1 0 0 IO-APIC-edge
4: 0 0 1 1 IO-APIC-edge
8: 16 15 15 15 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 1 1 0 1 IO-APIC-edge i8042
16: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb3
17: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb4
18: 47695411 47681526 47693374 47680775 IO-APIC-fasteoi
arcmsr, ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb8
22: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb7
23: 0 0 0 0 IO-APIC-fasteoi
ehci_hcd:usb2, uhci_hcd:usb6
28: 2376183 2377506 2376812 2376143 PCI-MSI-edge ahci
29: 14545152 14557669 14546472 14559769 PCI-MSI-edge eth0
NMI: 0 0 0 0 Non-maskable interrupts
LOC: 1522685098 614396609 1720798830 518770603 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 0 0 0 0 Performance
monitoring interrupts
PND: 0 0 0 0 Performance pending work
RES: 109858789 114294880 107422261 113139171 Rescheduling interrupts
CAL: 228945035 210709845 246864690 232136482 Function call interrupts
TLB: 1161 2146 1090 2319 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 4226 4226 4226 4226 Machine check polls
ERR: 0
MIS: 0
Also at: http://mizar.remote.agasha.com/k/kvm/interrupts.txt
--
Harri.
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