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 will run a bit faster. So we set
+ * a slight larger threshold for the queue head (1.25X) while the other queue
+ * nodes will keep the same threshold.
How did you come to 1.25x? These sort of magic numbers scare me.
Yes, this is kind of arbitrary. I am going to get rid of it in the v2 patch.
Cheers,
Longman
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