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

Paolo Bonzini pbonzini at redhat.com
Thu Aug 25 02:33:18 EDT 2011

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.


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