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Date: Wed, 28 Dec 2005 15:14:46 -0500
From: Mike Jakubik <mikej@rogers.com>
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To: Mark Ovens <marko@freebsd.org>
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Cc: freebsd-stable@freebsd.org
Subject: Re: RELENG_6: Which scheduler for SMP?
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Mark Ovens wrote:
> I've never had any success with the ULE scheduler on my dual Athlon 
> box running RELENG_5; it was so unstable it made Windows 3.1 look 
> stable. In fact my current build, cvsup'd a couple of days ago, won't 
> even boot with ULE.
>
> From what I remember, ULE was intended to become the default scheduler 
> during the life of 5.0 but that hasn't happened.
>
> I've just cvsup'd the source for RELENG_6 and I'm surprised to find in 
> the GENERIC config file:
>
> #options    SCHED_ULE    # ULE scheduler
> options     SCHED_4BSD    # 4BSD scheduler
>
> so it seems 4BSD is still the default scheduler. Is ULE _still_ 
> considered to be in development/experimental? Even the SMP config file 
> doesn't use ULE.


There have been substantial improvements made to it since 5. However no 
one will be able to tell you if its 100% ready, you will just have to 
try it on your system.