Re: George's annual rant (brief)

From: George Mitchell <george+freebsd_at_m5p.com>
Date: Sat, 13 Jul 2024 23:01:49 UTC
On 7/13/24 18:59, George Mitchell wrote:
> I've just tried my annual test of SCHED_4BSD Vs. SCHED_ULE on
> 13.3-RELEASE-p4.  I run a "make buildworld" with the port misc/dnetc
> running.  (It's a totally compute-bound process that gobbles up all
> available CPU cycles, but runs at "nice 20".)  Run time in seconds:
> 
> dnetc            SCHED_ULE                SCHED_4BSD
> running          56185                    25819
> not running      19372                    20319
> 
> This machine is also an NFS file server, but usually with a very
> low load.
> 
> I have been assured may times that there exists a set of conditions
> where SCHED_ULE will outperform SCHED_4BSD, but no one seems to know
> what they are.
> 
> That's all from me on this subject for this year.           -- George

Sorry, forgot to mention I filed
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280266
to suggest a change to misc/dnetc's install message.