On Fri, Nov 15, 2019 at 08:09:25AM +0800, Ming Lei wrote: > On Thu, Nov 14, 2019 at 02:14:34PM +0100, Peter Zijlstra wrote: > > On Thu, Nov 14, 2019 at 07:31:53PM +0800, Ming Lei wrote: > > > Hi Guys, > > > > > > It is found that single AIO thread is migrated crazely by scheduler, and > > > the migrate period can be < 10ms. Follows the test a): > > > > What does crazy mean? Does it cycle through the L3 mask? > > > > The single thread AIO thread is migrated in several milliseconds once. Today I found the migrate rate of single fio IO thread can reach 11~12K/sec when I run './xfs_complete 512' on another real machine (single numa node, 8 cores). And the number is very close to IOPS of the test, that said the fio IO thread can be migrated once just when completing one IO on the scsi_debug device. Thanks, Ming
