linux-kernel - Re: [patch] genapic: optimize & fix APIC mode setup

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Date:	Sun, 12 Nov 2006 17:50:51 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, ashok.raj@...el.com
Subject: Re: [patch] genapic: optimize & fix APIC mode setup

On Sat, Nov 11, 2006 at 04:20:24PM +0100, Andi Kleen wrote:
> On Saturday 11 November 2006 16:14, Ingo Molnar wrote:
> > 
> >  - removed the CPU hotplug hacks, switching the default for small
> >    systems back from phys-flat to logical-flat. The switching to logical 
> >    flat mode on small systems fixed sporadic ethernet driver timeouts i 
> >    was getting on a dual-core Athlon64 system:
> 
> That will break CPU hotplug on some Intel systems (Ashok can give details) 

There is an issue of using clustered mode along with cpu hotplug. More details
are at the below link.

http://marc.theaimsgroup.com/?l=linux-kernel&m=113261865814107&w=2

thanks,
suresh
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