Re: cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/i386/i386 mp_machdep.c

From: M. Warner Losh <imp_at_bsdimp.com>
Date: Sat, 10 Nov 2007 09:13:29 -0700 (MST)
In message: <20071110190555.I35816_at_delplex.bde.org>
            Bruce Evans <brde_at_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
Received on Sat Nov 10 2007 - 16:16:31 UTC