| From: | Sean Chittenden <sean(at)chittenden(dot)org> |
|---|---|
| To: | The Hermit Hacker <scrappy(at)postgresql(dot)org> |
| Cc: | lista(at)profit-ti(dot)com(dot)br, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Hyper-Threading |
| Date: | 2003-05-08 19:57:59 |
| Message-ID: | 20030508195759.GZ49916@perrin.int.nxad.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
> I've heard conflicting reports about HyperThreading in general
> ... by default, FreeBSD doesn't enable it (it originally did), as
> ppl were reporting performance degradation ... I'm using it on our
> servers, and haven't noticed any problems ...
Twiddle with the sysctl machdep.cpu_idle_hlt, that seemed to make a
big difference in terms of power consumption, heat, and effectiveness
of HTT. As the previous poster suggested, HTT promises lots, but
delivers little. Search the archives on FreeBSD.org for a set of
rather large threads regarding this topic. -sc
--
Sean Chittenden
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