Date: Mon, 26 Apr 2010 09:48:12 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-smp@freebsd.org Cc: Hubert Tournier <hubert@frbsd.org>, oklahoma <stopeme@gmail.com> Subject: Re: Disabling HyperThreading? Message-ID: <201004260948.12730.jhb@freebsd.org> In-Reply-To: <4BD563F7.4010203@googlemail.com> References: <28357071.post@talk.nabble.com> <28359495.post@talk.nabble.com> <4BD563F7.4010203@googlemail.com>
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On Monday 26 April 2010 5:59:19 am oklahoma wrote: > Hubert Tournier wrote: > > > > I forgot to specify that the system is a remote dedicated server, for which > > i have no physical access. > > > > I could rent a virtual KVM in order to try to access its BIOS settings, but > > i'm not sure this would work. > > > > Any other software solution? > if the server is dedicated entirely to you, ask your colo support to > disable it for you. > other thing i find was > > machdep.hlt_cpus > > is suppose to tell the scheduler that there is extra cores but not to use them. > try to enable and see with top is there app that use logical cores. You can manually disable any CPU (except for the boot CPU), via 'hint.lapic.X.disabled=1' in loader.conf. You can find the APIC IDs to use in place of 'X' in dmesg. -- John Baldwin
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