On Mon, 23 Jan 2017, Andriy Gapon wrote:
============================================================================== --- stable/10/sys/kern/sched_4bsd.c Mon Jan 23 08:34:41 2017 (r312665) +++ stable/10/sys/kern/sched_4bsd.c Mon Jan 23 08:34:51 2017 (r312666) @@ -963,8 +963,8 @@ sched_switch(struct thread *td, struct t sched_load_rem();td->td_lastcpu = td->td_oncpu; - preempted = !((td->td_flags & TDF_SLICEEND) || - (flags & SWT_RELINQUISH)); + preempted = (td->td_flags & TDF_SLICEEND) == 0 && + (flags & SW_PREEMPT) != 0; td->td_flags &= ~(TDF_NEEDRESCHED | TDF_SLICEEND); td->td_owepreempt = 0; td->td_oncpu = NOCPU;
Please also merge to FreeBSD-9. FreeBSD-9 has best performance for a makeworld benchmark. What is a good benchmark for showing that the fix helps? Involuntary context switches increased by almost a factor of 2 for the makeworld benchmark (over nfs) recently, but that was just caused by pessimizations in the NIC driver. Bruce _______________________________________________ svn-src-stable-10@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-stable-10 To unsubscribe, send any mail to "svn-src-stable-10-unsubscr...@freebsd.org"
