On 07/13/2015 03:50 PM, Davidlohr Bueso wrote:
On Sat, 2015-07-11 at 16:36 -0400, Waiman Long wrote:
/*
+ * Queued Spinlock Spin Thresholds
+ * ---
+ * Because of the cacheline contention effect of the ticket spinlock, the
+ * same spin threshold for queued spinlock
On Sat, 2015-07-11 at 16:36 -0400, Waiman Long wrote:
> /*
> + * Queued Spinlock Spin Thresholds
> + * ---
> + * Because of the cacheline contention effect of the ticket spinlock, the
> + * same spin threshold for queued spinlock will run a bit faster. So we set
> + * a
On Sat, Jul 11, 2015 at 04:36:54PM -0400, Waiman Long wrote:
> In an overcommitted guest where some vCPUs have to be halted to make
> forward progress in other areas, it is highly likely that a vCPU
> later in the spinlock queue will be spinning while the ones earlier in
> the queue would have been
In an overcommitted guest where some vCPUs have to be halted to make
forward progress in other areas, it is highly likely that a vCPU
later in the spinlock queue will be spinning while the ones earlier in
the queue would have been halted already. The spinning in the later
vCPUs is then just a waste
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