Standard deviation is also reported in (), and in general is about 3%įrom the average. Total number of ops (x10^7) reported at the end of each run.
Each number represents an average (over 25 runs) of the (four Intel Xeon E7-8895 v3 2.60GHz sockets with 18 hyperthreadedĬores each). The following locktorture results are from an Oracle X5-4 server We have done some performance evaluation with the locktorture moduleĪs well as with several benchmarks from the will-it-scale repo. NUMA node of the waiter at the head of the secondary queue at the time of The head of the primary queue, effectively changing the preference to the We do that by flushing the secondary queue into Preference after a waiter at the head of the secondary queue spins for aĬertain amount of time. That certain priortized waiters (e.g., in irq and nmi contexts) areĮxcluded from being moved to the secondary queue. Queue, leaving only waiters running on the same preferred NUMA node. This way, we gradually filter the primary If it is not, that waiter is detached from the main queue and moved into Waiter in the primary queue (if exists) is running on the same NUMA node. After acquiring the MCS lock andīefore acquiring the spinlock, the MCS lock holder checks whether the next
Threads store the ID of the node on which Node as the current lock holder, and a secondary queue for threads Organized in two queues, a primary queue for threads running on the same It isĮnabled through a configuration option (NUMA_AWARE_SPINLOCKS).ĬNA is a NUMA-aware version of the MCS lock. (compact NUMA-aware lock) as the slow path for qspinlock. Starvation of waiters on other NUMA nodes. Same NUMA node as the lock holder, provided care is taken to avoid Lock throughput can be increased by handing a lock to a waiter on the Linux-arm-kernel, linux-kernel, tglx, bp, hpa, x86, guohanjun,Ĭc: steven.sistare, daniel.m.jordan, alex.kogan, dave.diceįix documentation issue, as requested by Randy Dunlap and Longman. To: linux, peterz, mingo, acon, arnd, longman, linux-arch, ` (4 more replies) 0 siblings, 5 replies 9+ messages in thread 23:13 ` locking/qspinlock: Rename mcs lock/unlock macros and make them more generic Alex Kogan
#CMEDIA USB AUDIO DRIVER V12 ARCHIVE#
Add NUMA-awareness to qspinlock LKML Archive on help / color / mirror / Atom feed * Add NUMA-awareness to qspinlock 23:13 Alex Kogan
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