linux-kernel - Re: [PATCH 2/2]x86: spread tlb flush vector between nodes

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Date:	Wed, 20 Oct 2010 14:18:48 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	"hpa@...or.com" <hpa@...or.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [PATCH 2/2]x86: spread tlb flush vector between nodes

On Wed, Oct 20, 2010 at 02:08:32PM +0200, Peter Zijlstra wrote:
> On Wed, 2010-10-20 at 14:06 +0200, Andi Kleen wrote:
> > On Wed, Oct 20, 2010 at 01:20:52PM +0200, Peter Zijlstra wrote:
> > > On Wed, 2010-10-20 at 09:31 +0200, Andi Kleen wrote:
> > > > Really a lot of the per CPU scaling we have today should be per core
> > > > or per node to avoid explosion. 
> > > 
> > > Shouldn't that be per-cache instead of per-core?
> > 
> > That's the same on modern x86:
> 
> Last time I checked there's more than 1 directory in arch/

Not sure what your point is? 

I believe non x86 server processors have similar cache
layouts as the one I described, occasionally with another
cache level, and should do well with a similar setup.

For non server it typically doesn't matter too much
because there are not enough cores.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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