On Wed, Apr 08, 2015 at 02:32:19PM -0400, Waiman Long wrote: > For a virtual guest with the qspinlock patch, a simple unfair byte lock > will be used if PV spinlock is not configured in or the hypervisor > isn't either KVM or Xen. The byte lock works fine with small guest > of just a few vCPUs. On a much larger guest, however, byte lock can > have serious performance problem.
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