Subject: Re: 2.6.4-mm2
From: Len Brown <len.brown@intel.com>
To: Mark Wong <markw@osdl.org>
Cc: Andrew Morton <akpm@osdl.org>, axboe@suse.de, linux-kernel@vger.kernel.org
In-Reply-To: <A6974D8E5F98D511BB910002A50A6647615F5E2B@hdsmsx402.hd.intel.com>
References: <A6974D8E5F98D511BB910002A50A6647615F5E2B@hdsmsx402.hd.intel.com>
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Message-Id: <1079756877.7277.644.camel@dhcppc4>
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Date: 19 Mar 2004 23:27:57 -0500
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On Fri, 2004-03-19 at 23:19, Brown, Len wrote:
> On Fri, 2004-03-19 at 21:53, Mark Wong wrote:
> 
> > > Thanks, so it's the CPU scheduler changes.  Is that machine
> > hyperthreaded? 
> > > And do you have CONFIG_X86_HT enabled?
> > 
> > Yes and CONFIG_X86_HT is enabled but I have hyperthreading disabled
> > with
> > 'acpi=off noht' (whichever one does it.)  
> 
> CONFIG_X86_HT=y does not enable HT.
> CONFIG_X86_HT=n does not disable HT.
> It only controls if the cpu_sibling_map[] etc. are initialized.
> 
> acpi=off does not disable HT

oops, that line incorrect.
we fixed "acpi=off" to _really_ mean ACPI off -- table parsing
and all, so it does disable HT, along w/ all the other stuff
that depends on ACPI.

> "noht" doesn't exist.
> 
> Please see my message yesterday w/ subject "how to disable HT"
> 
> cheers,
> -Len


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