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Old 25th May 2008
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Default SCHED_ULE

what is SCHED_ULE ??? what is different between SCHED_ULE and SCHED_4BSD ???

and when I must use SCHED_ULE ???

which one is better and why ??
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Old 25th May 2008
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try google.
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Old 25th May 2008
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Also see sched_ule(4) and sched_4bsd(4), and ofcourse the FreeBSD maillist archives.
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Old 25th May 2008
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Short: it's the new kid on the block
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Old 26th May 2008
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SCHED_4BSD is the old, tried and true, original CPU scheduler. Works well on single-CPU systems. Doesn't scale to multi-CPU setups all that well. Especially on systems with 4 or more CPUs. This is the defaut scheduler on FreeBSD 4.x, 5.x, 6.x, and 7.0.

SCHED_ULE is the new, optimised-for-SMP scheduler that will eventually become the default scheduler for 7.x and beyond. Under some workloads, it's also better than 4BSD on single-CPU systems.

On FreeBSD 7.0, it's still considered experimental, but is recommended for those with multi-CPU or multi-core systems. A lot of fixes have gone into 7-STABLE (tag=RELENG_7 in csup supfiles), and it will be the default scheduler in 7.1.
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Old 26th May 2008
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>On FreeBSD 7.0, it's still considered experimental, but is recommended for those with multi-CPU or multi-core systems.

It's even recommended for those with UP-systems, because 4BSD scheduler in FreeBSD 7 isn't as fast as 4BSD in FreeBSD 6.x
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Old 26th May 2008
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You might also browse some of the entries on this blog if you are interested in the scheduler.

It's usually good reading when he does post something
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Old 26th May 2008
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I've been using SCHED_ULE on a P3-500 (single processor) for a while now, and no noticeable effects (except for the subjective "it feels more responsive").
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Old 2nd June 2008
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If you follow stable (tag=RELENG_7) it is the default scheduler.
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Old 3rd June 2008
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Quote:
Originally Posted by cajunman4life View Post
I've been using SCHED_ULE on a P3-500 (single processor) for a while now, and no noticeable effects (except for the subjective "it feels more responsive").
>it feels more responsive

This exactly is the purpose of a scheduler, it's not a performance boost, but responsiveness.
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