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Dor Laor wrote:
| On Fri, 2008-03-28 at 23:41 +0000, Antoine Martin wrote:
| 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?
Ooops, the guest I traced was started before loading them...
Here is one that got started after (sorry for the line noise):
select(5, [0 4], [], [], {0, 0}) = 0 (Timeout)
select(0, [], NULL, NULL, {0, 0}) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {1685112, 356558791}) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1caff0) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1caff0) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1caff0) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1caff0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356664879}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356683016}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356703393}) = 0
timer_gettime(0x1, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0x1, 0, {it_interval={0, 0}, it_value={0, 19000000}},
NULL) = 0
ioctl(6, 0xae80, 0) = 0
ioctl(6, 0xae80, 0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356829961}) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1cb160) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356866505}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356886845}) = 0
timer_gettime(0x1, {it_interval={0, 0}, it_value={0, 18844990}}) = 0
ioctl(6, 0xae80, 0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 356959171}) = 0
ioctl(6, 0xae80, 0) = 0
ioctl(6, 0xae80, 0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357036644}) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1cb160) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357072651}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357092946}) = 0
timer_gettime(0x1, {it_interval={0, 0}, it_value={0, 18639127}}) = 0
timer_settime(0x1, 0, {it_interval={0, 0}, it_value={0, 9158000}}, NULL) = 0
ioctl(6, 0xae80, 0) = 0
ioctl(6, 0xae80, 0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357235274}) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1cb160) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357271483}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357293651}) = 0
timer_gettime(0x1, {it_interval={0, 0}, it_value={0, 8985696}}) = 0
ioctl(6, 0xae80, 0) = 0
ioctl(6, 0xae80, 0) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357386790}) = 0
ioctl(5, 0x4008ae61, 0x7fff4f1cb160) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357422880}) = 0
clock_gettime(CLOCK_MONOTONIC, {1685112, 357442799}) = 0
|
|> Another thing to do is run with -clock=[unix|rtc]
What about -clock dynticks?
Isn't that going to reduce unnecessary calls?
Cheers
Antoine
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