Date: Wed, 3 May 2006 14:50:05 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Vinny Abello <vinny@tellurian.com> Cc: freebsd-stable@freebsd.org Subject: Re: Hyperthreading in 6.x ... still frowned upon? Message-ID: <20060503185005.GA31387@xor.obsecurity.org> In-Reply-To: <7.0.1.0.2.20060503132315.09da2cf8@tellurian.com> References: <20060503113955.U1147@ganymede.hub.org> <4458CE13.6060804@mac.com> <7.0.1.0.2.20060503132315.09da2cf8@tellurian.com>
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[-- Attachment #1 --] On Wed, May 03, 2006 at 01:36:04PM -0400, Vinny Abello wrote: > An Intel technical rep that gave a presentation on upcoming Intel VT > technology in processors (Virtualization Technology) that I attended > indicated that Hyperthreading was really designed to start getting > programmers to program threading into their applications in > preparation of dual core processors that we now have. That sounds like an interesting interpretation of history :-) > I typically disable Hyperthreading on all my servers as they are dual > processor or dual core/dual processor or better anyway. I tend to get > better results (with my applications) without Hyperthreading. I've > been experimenting with leaving it on with my workstation as it's not > a dual core or dual processor. In my experience it's almost always a net loss too. One should measure for oneself though. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEWPtdWry0BWjoQKURAt7jAJ4pZIeCIeUvMUHxI5BDulTOAnAcJQCfZXPF 8bEfR4BSuKbdDPcELnYvcdI= =N7Cp -----END PGP SIGNATURE-----
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