Re: [Xen-devel] Xen spinlock questions

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Jan Beulich wrote:
> Running kernel builds on 8 vCPU-s competing for 4 pCPU-s shows a 10%
> improvement in performance with the individual wakeup (patch attached
> - probably sub-optimal, but I didn't seem to be able to think of a lock-less
> mechanism to achieve the desired behavior), using ticket locks in the
> kernel.
What exactly are you measuring here?  Are you testing your 2.6.2x 
forward-port with an adaptation of pv spinlocks using ticket locks as 
the underlying locking mechanism?  Does the 10% improvement come 
compared to straightforward use of sched_poll, or compared to doing 
spurious wakeup detection?
   J

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