Re: SCHED_BSD vs SCHED_ULE ...
From: Robert Watson (rwatson_at_freebsd.org)
Date: 05/30/04
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Date: Sat, 29 May 2004 21:08:21 -0400 (EDT) To: "Marc G. Fournier" <scrappy@hub.org>
On Sat, 29 May 2004, Marc G. Fournier wrote:
> Is there a circumstance where the older SCHED is better then ULE?
Yes. I've noticed differing performance properties based on a number of
factors, including hardware variation and workload. I've also noticed a
couple of bugs in ULE that I'm hoping Jeff Roberson gets a chance to fix
at some point, including some issues with load balancing.
> Or is the older one something that will eventually just be removed
> altogether?
>
> If the older does have areas in which it is the better, are there any
> docs comparing the two?
Well, I think it's useful to keep around 4BSD even if only to use as a
performance baseline for understanding where ULE is working better or
worse. I don't know of any specific documents talking about relative
merits: generally, I would consider if a bug if ULE is consistently slower
in some form. As such, any document would probably be an excellent bug
report :-).
As people run into performance issues with -CURRENT, the scheduler is
one of the first variables I would ask someone to check, FYI. And in that
sense, keeping 4BSD around is extremely valuable.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org Senior Research Scientist, McAfee Research
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