Date: Mon, 03 Mar 2003 14:54:32 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-current@FreeBSD.ORG, Trish Lynch <trish@bsdunix.net> Subject: Re: hype(r)threading Message-ID: <XFMail.20030303145432.jhb@FreeBSD.org> In-Reply-To: <0c9101c2e1bd$aa9a1b50$932a40c1@PHE>
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On 03-Mar-2003 Petri Helenius wrote: > After some reading around I ended up putting a return; on top of > the mptable_hyperthread_fixup function and my performance is back. > Setting the sysctl helps some but it does not really fix the performance issues. > > I would like to make the suggestion of making the HT "fixup" maybe a default > but allow disabling with a kernel variable? I'm going to add a 'HTT' kernel option that I'll backport prior to 4.8. > Pete > > On Mon, 3 Mar 2003, Petri Helenius wrote: > >> >> I seem to want to quite the opposite what other people would like to happen, >> we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to >> want to launch the virtual cores regardless of BIOS setting of HyperThreading being >> [Disabled]. >> >> Any ideas how to disable the cores since our workload is does not benefit from >> having more than two cores in a machine. >> >> Pete >> > > Currently, AFAIK, there is no way to do this. > > Depending on what you are doing you can increase performance slightly by > setting machdep.cpu_idle_hlt=1 > > -Trish > > -- > Trish Lynch trish@bsdunix.net > Ecartis Core Team trish@listmistress.org > EFNet IRC Operator @ efnet.demon.co.uk AilleCat@EFNet > EFNet IRC Operator/SysAdmin @ irc.dkom.at Aille_AT@EFNet > Key fingerprint = 781D 2B47 AA4B FC88 B919 0CD6 26B2 1D62 6FC1 FF16 > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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