On 04/24/2010 02:21 AM, David S. Ahern wrote:
quoted text
>
> On 04/23/2010 04:21 PM, BRUNO CESAR RIBAS wrote:
>    
>> Could you try hpet? I had similar problem with multicore and multiCPU (per
>> mother board) [even with constant_tsc].
>>
>> Since I changed the guest to hpet i had no more problems.
>>      
> It's stable in the sense of no lockups yet, but is a much slower time
> source from a gettimeofday perspective compared to tsc and jiffies
> (based on speed jiffies appears to be tsc-based).
>    

Jiffies doesn't sample any hardware; instead, a timer interrupt causes a 
counter to be incremented, and that counter is sampled.  The downside is 
that clock granularity is very low - you can't use it for accurate timing.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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