Messages in this thread | | | Subject | Re: [PATCH 3/7] locking/pvqspinlock: Implement wait-early for overcommitted guest | From | Davidlohr Bueso <> | Date | Mon, 13 Jul 2015 12:50:22 -0700 |
| |
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.
| |