On 08/20/2010 07:08 AM, Glauber Costa wrote:
quoted text
> On Thu, Aug 19, 2010 at 10:07:19PM -1000, Zachary Amsden wrote:
>    
>> The VMCB is reset whenever we receive a startup IPI, so Linux is setting
>> TSC back to zero happens very late in the boot process and destabilizing
>> the TSC.  Instead, just set TSC to zero once at VCPU creation time.
>>
>> Why the separate patch?  So git-bisect is your friend.
>>
>> Signed-off-by: Zachary Amsden<zamsden@redhat.com>
>>      
> Shouldn't we set for whatever value the BSP already has, and then the BSP to
> zero? Since vcpus are initialized at different times, this pretty much
> guarantees that the guest will have desynchronized tsc at all cases
> (not that if it was better before...)
>    

Yes, we should - but it takes a lot more machinery to do that, and so it 
happens later in the series.  You have to match the offsets for the BSP 
and other vcpus...
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