Date: Mon, 3 Mar 2003 21:47:02 +0200 From: "Petri Helenius" <pete@he.iki.fi> To: "Trish Lynch" <trish@bsdunix.net> Cc: <freebsd-current@FreeBSD.ORG> Subject: Re: hype(r)threading Message-ID: <0c9101c2e1bd$aa9a1b50$932a40c1@PHE> References: <20030303142353.C830-100000@femme>
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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? 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
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