Keir Fraser wrote:
> On 23/02/2009 22:33, "Yang, Xiaowei" <xiaowei.yang@intel.com> wrote:
> 
>> For further improvement to reach the effect of 3), e.g. by taking care
>> of cache consistance amongs CPUs, there will be more overhead. And
>> considering the function is called per second, we are hesitating to do
>> this. What's your idea?:)
> 
> Maybe we should see what that overhead is... Also we may not really need to
> run that function every second.
> 
>  -- Keir
> 
> 

I measured time_calibration_rendezvous()'s overhead on my machine. It's 
around 5-6k TSC. And I made anther patch to add loop. The cycle skew 
introduced by TSC-sync is gone with it. And a bit surprisingly, the 
expected extra overhead is not even noticeable:)

The new patch is attached.

Thanks,
Xiaowei