cvs commit: src/sys/kern sched_ule.c
alfred at freebsd.org
Fri Jan 26 22:34:38 UTC 2007
* Jeff Roberson <jroberson at chesapeake.net> [070125 19:47] wrote:
> On Thu, 25 Jan 2007, Jeff Roberson wrote:
> >jeff 2007-01-25 23:52:00 UTC
> > FreeBSD src repository
> > Modified files:
> > sys/kern sched_ule.c
> > Log:
> > - Implement much more intelligent ipi sending. This algorithm tries to
> > minimize IPIs and rescheduling when scheduling like tasks while keeping
> > latency low for important threads.
> Forgot: Will IPI when:
> > 1) An idle thread is running.
> > 2) The current thread is worse than realtime and the new thread is
> > better than realtime. Realtime to realtime doesn't preempt.
> > 3) The new thread's priority is less than the threshold.
Out of curiosity, have you tried a polling mode where the idlethread
will check a word each iteration an in effect pull a soft IPI?
I'm not sure this would help or hinder, but it is of interest to me.
- Alfred Perlstein, RED Incorporated Consulting.
- coder / sysadmin / FreeBSD Hacker / All that jazz -
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