On 04/19/2010 12:29 PM, Gleb Natapov wrote:
On Mon, Apr 19, 2010 at 11:21:47AM +0200, Espen Berg wrote:
Den 18.04.2010 11:56, skrev Gleb Natapov:
That's two different things here:
The issue that Espen is reporting is that the hosts have different
frequency and guests that relay on the tsc as a source clock will
notice that post migration. The is indeed a problem that -tdf does
not solve. -tdf only adds compensation for the RTC clock emulation.
It's -rtc-td-hack. -tdf does pit compensation, but since usually kernel
pit is used it does nothing.
So this "hack" will not solve our problem?
As I also stated, in the past the kvmclock MSRs were not sync upon live
migration and it was fixed in 1a03675db146dfc760b3b48b3448075189f142cc ,
better check with the code.
If your guest uses RTC for time keeping it may help. Otherwise it does
nothing.
--
Gleb.
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