From: William Lee Irwin III <wli@holomorphy.com>
To: Nick Craig-Wood <ncw1@axis.demon.co.uk>
Cc: linux-kernel@vger.kernel.org, Rohit Seth <rohit.seth@intel.com>
Subject: Re: 2.6.0 Huge pages not working as expected
Date: Fri, 26 Dec 2003 03:56:47 -0800 [thread overview]
Message-ID: <20031226115647.GH27687@holomorphy.com> (raw)
In-Reply-To: <20031226105433.GA25970@axis.demon.co.uk>
On Fri, Dec 26, 2003 at 10:54:33AM +0000, Nick Craig-Wood wrote:
> I wrote a little test program to show the benefits of huge pages by
> reducing TLB thrashing - it fills up 16 MB with sequential numbers
> then adds them with different strides - very much the sort of thing
> FFTs do. However huge pages show a performance decrease not increase
> for large strides! For smaller ones there is a small speedup.
> I've been testing on
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 8
> model name : Pentium III (Coppermine)
P-III has something like 2 TLB entries usable for large pages.
I recommend trying this again on a P-IV.
-- wli
next prev parent reply other threads:[~2003-12-26 11:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-26 10:54 2.6.0 Huge pages not working as expected Nick Craig-Wood
2003-12-26 11:56 ` William Lee Irwin III [this message]
2003-12-26 20:10 ` Nick Craig-Wood
2003-12-26 20:15 ` William Lee Irwin III
2003-12-26 20:33 ` Linus Torvalds
2003-12-27 3:36 ` Andrea Arcangeli
2003-12-27 4:01 ` Linus Torvalds
2003-12-27 9:28 ` David S. Miller
2003-12-27 15:58 ` Andrea Arcangeli
2003-12-27 9:01 ` Nick Craig-Wood
2004-01-06 14:24 ` Kurt Garloff
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