[ltt-dev] [RFC PATCHv2 4/5] urcu: re-implment urcu-qsbr

[Lai Jiangshan]

On 08/25/2011 02:33 PM, Paolo Bonzini wrote:
> On 08/25/2011 08:03 AM, Lai Jiangshan wrote:
>>
>> My synchronize_rcu() is slower. (will be optimized)
>> At the sametime, I test Paolo's patch, I don't know why it slowdowns synchronize_rcu()
>> in my box.
> 
> I think you can try changing the number of busy wait cycles before it starts using the futex.  

>I was measuring with 10 readers, not 3.  It makes sense to wait more with fewer readers.

But my box just has 4 cores(i5 760).

Lai

> 
> Paolo
>