Date: Fri, 17 Nov 2006 09:20:11 GMT From: Ariff Abdullah <ariff@FreeBSD.org> To: freebsd-i386@FreeBSD.org Subject: Re: i386/104678: SMP not working on Turion XP Laptop Message-ID: <200611170920.kAH9KB8S061375@freefall.freebsd.org>
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The following reply was made to PR i386/104678; it has been noted by GNATS.
From: Ariff Abdullah <ariff@FreeBSD.org>
To: bug-followup@FreeBSD.org, danolson@visi.com, rainer.alves@gmail.com,
infofarmer@FreeBSD.org, bde@zeta.org.au
Cc: jhb@FreeBSD.org
Subject: Re: i386/104678: SMP not working on Turion XP Laptop
Date: Fri, 17 Nov 2006 17:15:01 +0800
It seems the workaround is rather simple:
machdep.cpu_idle_hlt=0
Unfortunately, the only place where you can set that is after the
system comes alive. This patch deals with that so that you can set it
as early as possible during boot procedure through loader.conf.
http://people.freebsd.org/~ariff/misc/turionX2.diff
Summary:
Basically the cpu enter deep sleep mode whenever it receives HLT
call within idle loop, and that only if APIC + Local APIC timer is
enabled. I can't tell whether it is because of APIC misseting, CPU bug
or else, but one thing for sure, FreeBSD 5.x/SMP boots happily on this
(well, that's because it doesn't use local APIC timer). With idle HLT
disabled, there will be a slight power savings penalty especially if
the cpu just sit idle doing nothing else.
CPU Errata:
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/33610.pdf
Perhaps jhb@ might have an interest in this issue.
--
Ariff Abdullah
FreeBSD
... Recording in stereo is obviously too advanced
and confusing for us idiot ***** users :P ........
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