On Thursday 01 May 2008 7:16:53 pm Marcelo Tosatti wrote:
> Does -no-kvm-irqchip or -no-kvm-pit makes a difference? If not, please
> grab kvm_stat --once output when that happens.
Per some suggestions I have moved up to kvm-68 which is better, but still
having problems. Replicating the problem with only one guest spinning has
proven quite difficult, but attempting to boot a large smp guest can reliably
recreate the problem. Using -no-kvm-pit did not help the large guest
and -no-kvm-irqchip made it seize up even earlier with only 1 cpu spinning
instead of all of them.
>
> Also run "readprofile -r ; readprofile -m System-map-of-guest.map" with the
> host booted with "profile=kvm". Make sure all guests are running the same
> kernel image.
I got this from a spinning 16-way guest with only 8 of the host CPUs online
and without either -no-kvm-irqchip or -no-kvm-pit:
[EMAIL PROTECTED] ~]# readprofile -r ; readprofile -m
karl/System.map-2.6.25-03591-g873c05f
101 native_read_tsc 3.4828
1 read_persistent_clock 0.0192
25 kvm_clock_read 0.2660
95 getnstimeofday 0.7252
13 update_wall_time 0.0138
1 second_overflow 0.0020
readprofile: profile address out of range. Wrong map file?
The kvm_stat output during this is:
[EMAIL PROTECTED] ~]# kvm_stat --once
efer_reload 23354 0
exits 3587109 2250
fpu_reload 1934298 0
halt_exits 4583 0
halt_wakeup 42 0
host_state_reload 2165502 167
hypercalls 1482 0
insn_emulation 900199 0
insn_emulation_fail 0 0
invlpg 0 0
io_exits 1983116 0
irq_exits 427728 2250
irq_window 0 0
largepages 0 0
mmio_exits 163522 0
mmu_cache_miss 176 0
mmu_flooded 99 0
mmu_pde_zapped 191 0
mmu_pte_updated 10 0
mmu_pte_write 59030 0
mmu_recycled 0 0
mmu_shadow_zapped 99 0
pf_fixed 14890 0
pf_guest 0 0
remote_tlb_flush 29 0
request_irq 0 0
signal_exits 1 0
tlb_flush 481952 0
The output with -no-kvm-pit looked almost identical and with -no-kvm-pit there
was no samples registered for either tool.
--
Karl Rister
IBM Linux Performance Team
[EMAIL PROTECTED]
(512) 838-1553 (t/l 678)
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
kvm-devel mailing list
kvm-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/kvm-devel
