Date: Mon, 3 Mar 2003 22:02:57 +0200 From: "Petri Helenius" <pete@he.iki.fi> To: "John Baldwin" <jhb@FreeBSD.org> Cc: <freebsd-current@FreeBSD.org>, "Trish Lynch" <trish@bsdunix.net> Subject: Re: hype(r)threading Message-ID: <0c9f01c2e1bf$e2d4b870$932a40c1@PHE> References: <XFMail.20030303145432.jhb@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Thanks, thatīs greatly appreciated. Pete > > 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 Xeonīs. 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?0c9f01c2e1bf$e2d4b870$932a40c1>