On Wed, 22 Feb 2017, Waiman Long wrote:
On a 2-socket 36-core 72-thread x86-64 E5-2699 v3 system, a rwsem microbenchmark was run with 36 locking threads (one/core) doing 100k reader and writer lock/unlock operations each, the resulting locking rates (avg of 3 runs) on a 4.10 kernel were 561.4 Mop/s and 588.8 Mop/s without and with the patch respectively. That was an increase of about 5%.
iirc this patch is a repost, no? If so, did you get a chance to measure single file access with direct io as dchinner suggested? Thanks, Davidlohr
