From owner-freebsd-current  Mon Mar  3 12: 3: 5 2003
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From: "Petri Helenius" <pete@he.iki.fi>
To: "John Baldwin" <jhb@FreeBSD.org>
Cc: <freebsd-current@FreeBSD.org>, "Trish Lynch" <trish@bsdunix.net>
References: <XFMail.20030303145432.jhb@FreeBSD.org>
Subject: Re: hype(r)threading
Date: Mon, 3 Mar 2003 22:02:57 +0200
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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
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> >
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
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>
> --
>
> John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> "Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
>


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