Date: Mon, 13 Mar 2006 15:59:36 +0000 From: Pete French <petefrench@ticketswitch.com> To: wmoran@collaborativefusion.com Cc: bseklecki@collaborativefusion.com, freebsd-amd64@freebsd.org Subject: Re: How is hyperthreading handled on amd64? Message-ID: <E1FIpSK-0000Cs-UP@dilbert.firstcallgroup.co.uk> In-Reply-To: <20060313104137.5fcc80ea.wmoran@collaborativefusion.com>
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> Again, not what I'm seeing here. It appears as if the machine behaves > identically no matter what machdep.hyperthreading_allowed is set to. > The machine I'm testing on only has a single physical processor. > > I've been running ubench multiple times to test this, and I see processes > on CPUs 1 and 0 no matter what I set the above sysctl to. I also don't > see any difference in ubench's performance numbers. Actually, I just upgraded this machine to 6.1 and now I am seeing much the same thing - no matter what I set machdep.hyperthreading_allowed and machdep.hlt_logical_cpu to I still see stuff on both CPUs. I havent doe any performance measurements though. -pete.
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