Problem with HT support in 5.4

Kris Kennaway kris at obsecurity.org
Sat May 28 11:28:01 PDT 2005


On Sat, May 28, 2005 at 09:45:52AM -0400, Louis LeBlanc wrote:
> On 05/27/05 09:28 PM, Mike Tancsa sat at the `puter and typed:
> > On Fri, 27 May 2005 09:30:46 -0500, in sentex.lists.freebsd.questions
> > you wrote:
> > >> 
> > >> Oh, wait, it is probably just the last HT security patch,
> > >> ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc.
> > >
> > >hmm... So basically, SMP can be enabled, but it won't use HT even if it
> > >sees a capable processor? 
> > 
> > Unless you use the ULE scheduler (which is broken and buggy on
> > RELENG_5) there is no benefit to using HT. In fact, it will make some
> > things worse.
> 
> Are you sure about that?  I'm using the BSD scheduler on 5.3
> (upgrading to 5.4 later today), with HT enabled, and I don't have
> problems.  In fact, I can do a make buildworld AND play neverwinter
> nights at the same time without seeing any problems.

He means that some workloads will be slower with HT than without.
It's very much workload-specific though, so you have to test and see
how it performs for you.

Kris

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