Date: Tue, 28 Mar 2023 05:34:33 -0500 From: Shaun Loo <loo00013@umn.edu> To: George Mitchell <george+freebsd@m5p.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Periodic rant about SCHED_ULE Message-ID: <fceb990c-7870-c694-316a-c40a0f4a9fc4@umn.edu> In-Reply-To: <efbce2d1-dfc1-f6e2-6a32-c9fb411e4daf@m5p.com> References: <ZB%2B/CjZOv0C0pzOX@disp.intra.daemon.contact> <efbce2d1-dfc1-f6e2-6a32-c9fb411e4daf@m5p.com>
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On Sun, Mar 26, 2023 at 1:24 PM George Mitchell <george+freebsd@m5p.com
<mailto:george%2Bfreebsd@m5p.com>> wrote:
On 3/25/23 23:42, Peter wrote:
> Quoting George Mitchell <george+freebsd@m5p.com
<mailto:george%2Bfreebsd@m5p.com>>:
>
> On 3/25/23 11:47, Peter wrote:
>>> You're welcome. Can I get a success/failure report?
>>>
>>>
>>> [...]
>> Thanks for your help. Regretfully, I have to report that the patch
>> did not really help in my case (make buildworld while running
dnetc).
>> But I have belatedly realized that it's a really good idea to use
>> make -j12 to build kernels and the world. With 4BSD and dnetc
>> running, I can now buildworld in 3512 seconds (down from 20477), and
>> with ULE in 14193 seconds (down from 50290). Peter's patch got it
>> down to 13755 seconds.
>
> Thank You for testing. So at least it doesn't make things worse.
> Back then 5 years ago when I made that, I think I've seen a few
> more strange things in that code, but they didn't bother me
immanently
> at that point. Probably there is more work to do there...
To oversimplify the discussion I've seen so far on this thread:
It would be really nice if the schedulers were kernel loadable modules.
GSoC project?
I'm definitely eager to put forth a GSoC project to make schedulers into
kernel modules! I'll be reviewing how to write kernel modules such that I'll
be in a good position when GSoC comes. I've been checking this thread
on-and off for the past few days so I definitely think I'm in a good
position
to work on exactly this!
Is anyone in this thread willing and able to be my mentor? I'll try to
come up
with a compelling proposal in the next couple days or so to get an
application
in right before the April 4th deadline.
--Shaun
Whether SCHED_ULE or SCHED_4BSD should be the default scheduler in the
GENERIC kernel is a contentious discussion, but perhaps we need to have
that discussion. -- George
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