Hyperthreading and schedulers [was Re: looking for a good sata or scsi raid 0/1 controller]

[Mike Tancsa]

On Mon, 25 Apr 2005 17:54:20 -0700, in sentex.lists.freebsd.questions
you wrote:

>At 05:33 PM 4/25/2005, Mike Tancsa wrote:
>>I would start by turning off Hyperthreading as
>>that only really works if you are using the ULE scheduler and thats
>>broken under RELENG_5.
>
>I haven't noticed this mentioned before.  Is using an SMP kernel on a 
>system with a single P4 and SCHED_4BSD a waste of time? Is it 
>detrimental?  I've never noticed any problems myself, but I never went 
>looking for any either.
>

See
http://www.onlamp.com/pub/a/bsd/2005/01/20/smpng.html
and
http://lists.freebsd.org/pipermail/freebsd-stable/2003-December/005360.html
to start.  Also, the ULE scheduler is still broken

	---Mike

>-Glenn
>
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Mike Tancsa, Sentex communications http://www.sentex.net
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