On 03/05/2010 07:05 AM, Daniel P. Berrange wrote:
On Fri, Mar 05, 2010 at 06:50:47AM -1000, Zachary Amsden wrote:
On 03/05/2010 04:27 AM, Daniel P. Berrange wrote:
* HPET
Multiple timers with periodic interrupts
Can replace PIT/RTC timers
They all generally suck in real hardware, and this gets worse in virtual
machines.
Many different approaches to making them suck less in VMWare, Xen& KVM,
but there
are some reasonably common concepts....
HPET doesn't suck.
The VMWare timekeeping docs mentions that it has timeout race conditions,
poorly defined spec for timer granularity, drift& speed of access,& bad
implementations in the real world which I read as 'sucks' ;-)
Which can also be read as nearly perfectly virtualizable due to extreme
variations in tolerance and hardened guest code ;)
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