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

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Message-ID: <20061113105819.E17720@unix-os.sc.intel.com>
Date:	Mon, 13 Nov 2006 10:58:19 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, ashok.raj@...el.com
Subject: Re: [patch] genapic: optimize & fix APIC mode setup

On Mon, Nov 13, 2006 at 08:04:52PM +0100, Ingo Molnar wrote:
> * Siddha, Suresh B <suresh.b.siddha@...el.com> wrote:
> > On Mon, Nov 13, 2006 at 07:42:56PM +0100, Ingo Molnar wrote:
> > > but i'd be fine with never going into cluster mode, instead always 
> > > using physical flat mode when having more than 8 APICs (independent 
> > > of the presence of CPU hotplug). On small systems, logical flat mode 
> > > is what is the best-tested variant (it's also slightly faster).
> > 
> > Ok.
> 
> ok, that's really good. Is there any 'weird' platform that you are aware 
> of that absolutely needs clustered APIC mode (because it has no physical 
> delivery mode or something)?

None that I am aware of, atleast in the x86_64 world.
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