Date: Fri, 13 Jun 2003 12:38:39 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: Killing <killing@barrysworld.com> Cc: freebsd-smp@freebsd.org Subject: Re: SMP in 5.1 cant deactivate hyperthreading Message-ID: <20030613123718.S69249@carver.gumbysoft.com> In-Reply-To: <024201c330f4$e58fdcf0$7b07000a@int.mediasurface.com> References: <F33F0D32429BD1458C34E3315053CE520FB830@xch-nw-28.nw.nos.boeing.com><012201c32fac$3f1cfa90$b3db87d4@vader> <024201c330f4$e58fdcf0$7b07000a@int.mediasurface.com>
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On Thu, 12 Jun 2003, Killing wrote: > > Halting them will still cause the CPUs to be detected. They just won't do > > any useful work. > > Yep but the issue is that all the core admin tools are unaware of this and > hence include the virtual cores in idle calcs etc making load monitoring > impossible without nasty cludges :( > > So what's the way forward? > 1. Dont just use halt have a compile or other directive to disable them? > 2. Update all tools to be halt aware? > > Personally I'd go with 2 all be it more work / ramifications on other 3rd party > tools as it gives the benefit of also working when physical CPU's are halted. Guh. Checking with some people here, it appears that the HT stuff is still undergoing some tweaking. I'd suggest that you stay tuned for any commits from john baldwin re: HT. Your case appears to be unique. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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