linux-kernel - Re: [RFC] i386: Remove page sized slabs for pgds and pmds

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Message-ID: <Pine.LNX.4.64.0703281356080.13258@schroedinger.engr.sgi.com>
Date:	Wed, 28 Mar 2007 14:00:44 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	William Lee Irwin III <wli@...omorphy.com>
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [RFC] i386: Remove page sized slabs for pgds and pmds

On Wed, 28 Mar 2007, William Lee Irwin III wrote:

> Getting the relevant results without tremendous amounts of noise from
> other kernel activity needs something like lmbench's fault and fork()
> microbenchmarks. Also, /proc/profile and/or oprofile results would be
> useful here to get useful notions of what's happening performancewise,
> in particular oprofile with L2 cache miss performance counters.

The machine had a minimal debian root and it was run on a serial console.

> it's in the noise. PMD and PTE caching are only pertinent to fork()
> anyway, so the vast majority of your workload is unaffected, and it's

I'd be interested to see some numbers here. I still believe the situation 
to be better on IA64 and other platforms due to the larger page sizes 
containing many more cachelines which should make the effect bigger.

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