linux-kernel - Re: [PATCH 0/6] x86: Reduce Memory Usage and Inter-Node message traffic (v2)

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Message-Id: <20070825095223.c6822bd2.randy.dunlap@oracle.com>
Date:	Sat, 25 Aug 2007 09:52:23 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andi Kleen <ak@...e.de>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>, travis@....com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 0/6] x86: Reduce Memory Usage and Inter-Node message
 traffic (v2)

On Sat, 25 Aug 2007 11:24:35 +0200 Andi Kleen wrote:

> On Fri, Aug 24, 2007 at 05:50:18PM -0700, Siddha, Suresh B wrote:
> > On Fri, Aug 24, 2007 at 03:26:54PM -0700, travis@....com wrote:
> > > Previous Intro:
> > 
> > Thanks for doing this.
> > 
> > > In x86_64 and i386 architectures most arrays that are sized
> > > using NR_CPUS lay in local memory on node 0.  Not only will most
> > > (99%?) of the systems not use all the slots in these arrays,
> > > particularly when NR_CPUS is increased to accommodate future
> > > very high cpu count systems, but a number of cache lines are
> > > passed unnecessarily on the system bus when these arrays are
> > > referenced by cpus on other nodes.
> > 
> > Can we move cpuinfo_x86 also to per cpu area? Though critical run
> 
> I worry how much impact that would be? boot_cpu_data is quite 
> widely used. 
> 
> > Wonder if this confusion is the reason for git commit f3fa8ebc
> 
> What git commit (full id) ? 

Looks like it's
commit f3fa8ebc25129bb69929e20b0c84049c39029d8d
Author: Rohit Seth <rohitseth@...gle.com>
Date:   Mon Jun 26 13:58:17 2006 +0200

    [PATCH] x86_64: moving phys_proc_id and cpu_core_id to cpuinfo_x86

---
~Randy
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