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Date: Sat, 10 Nov 2007 09:13:29 -0700 (MST)
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To: brde@optusnet.com.au
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: sobomax@FreeBSD.ORG, src-committers@FreeBSD.ORG, cvs-src@FreeBSD.ORG,
	kris@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cperciva@FreeBSD.ORG, nate@root.org
Subject: Re: cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/i386/i386
 mp_machdep.c
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In message: <20071110190555.I35816@delplex.bde.org>
            Bruce Evans <brde@optusnet.com.au> writes:
: On Fri, 9 Nov 2007, Maxim Sobolev wrote:
: 
: > For what it is worth I think Nate has the correct point. We should not force 
: > this setting upon each and every user if it can realistically affect only 
: > 0.0001% of our userbase. Leaving this setting on for production server that 
: > does lot of sensitive crypto and has lot of untrusted remote users is like 
: > leaving open access to the server console in the common room. At the same 
: > time, most of us have open access to consoles of their laptops/desktops at 
: > home/work.
: 
: Nothing is forced, since the setting is only the default.
: 
: Off is a good default since hyperthreading seems to be a pessimization
: in most casts.

hyperthreading for mysql using ULE is a big gain.  What workloads is
it a pessimization?

Warner