Re: idle load

[Dor Laor <dor.laor@gmail.com>]

On Fri, 2008-03-28 at 23:41 +0000, Antoine Martin wrote:
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> 
> Hi,
> 
> Guests seem to be doing a lot of timer related polling, is there any way
> to reduce that (which would reduce load on the host):
> 

It's weird we don't see any ioctl in the middle, are you sure kvm
modules are loaded?
Please provide host&guest os + qemu cmdline.

Except that output of "sudo strace -c -tt -p `pgrep qemu` & sleep 10 ;
sudo pkill strace " will help.

Another thing to do is run with -clock=[unix|rtc]

HTH,
Dor

> select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
> clock_gettime(CLOCK_MONOTONIC, {1046993, 598906624}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 598955741}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599002421}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599048737}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 0}}) = 0
> timer_settime(0x2, 0, {it_interval={0, 0}, it_value={0, 11000000}},
> NULL) = 0
> select(4, [0 3], [], [], {0, 0})        = 0 (Timeout)
> select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599305034}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599352080}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599442433}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599490141}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599536708}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 10572102}}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599650500}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599697967}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599744129}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 10364877}}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599850495}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599898120}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 599944263}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 10164841}}) = 0
> timer_settime(0x2, 0, {it_interval={0, 0}, it_value={0, 558000}}, NULL) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600340673}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600389516}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600436196}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 126861}}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600542537}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600590172}) = 0
> - --- SIGALRM (Alarm clock) @ 0 (0) ---
> rt_sigreturn(0)                         = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600727594}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 0}}) = 0
> timer_settime(0x2, 0, {it_interval={0, 0}, it_value={0, 10000000}},
> NULL) = 0
> select(4, [0 3], [], [], {0, 0})        = 0 (Timeout)
> select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
> clock_gettime(CLOCK_MONOTONIC, {1046993, 600978104}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 601024560}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 601070676}) = 0
> clock_gettime(CLOCK_MONOTONIC, {1046993, 601117316}) = 0
> timer_gettime(0x2, {it_interval={0, 0}, it_value={0, 9665212}}) = 0
> timer_settime(0x2, 0, {it_interval={0, 0}, it_value={0, 9000000}}, NULL) = 0
> select(4, [0 3], [], [], {0, 10000})    = 0 (Timeout)
> select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
> 
> 
> Cheers
> Antoine
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> 
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