Date: Thu, 7 May 2009 09:17:15 +0100 From: Bob Bishop <rb@gid.co.uk> To: pluknet <pluknet@gmail.com> Cc: Barney Cordoba <barney_cordoba@yahoo.com>, "Current@freebsd.org" <Current@freebsd.org> Subject: Re: Hypertherading Message-ID: <32413E83-2059-4A47-AB45-EA7A1A509DD6@gid.co.uk> In-Reply-To: <a31046fc0905061955u4a7b5755ifbcd7bd5641cd954@mail.gmail.com> References: <270637.78561.qm@web63905.mail.re1.yahoo.com> <a31046fc0905061955u4a7b5755ifbcd7bd5641cd954@mail.gmail.com>
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Hi, On 7 May 2009, at 03:55, pluknet wrote: > 2009/5/7 Barney Cordoba <barney_cordoba@yahoo.com>: >> >> I just got a shiny new nehalem box and it comes up with 16 >> processors with dual quads installed. Is there any benefit or >> should hyperthreading be disabled? >> > > Hi. There is a measurable win if hyperthreading is enabled [1]. AFAICS the reference doesn't support that conclusion at all. > You can switch it off via machdep.hyperthreading_enabled loader > tunable. > > [1] http://lists.freebsd.org/pipermail/freebsd-stable/2009-January/047460.html -- Bob Bishop rb@gid.co.uk
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