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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20031226115647.GH27687@holomorphy.com \
--to=wli@holomorphy.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ncw1@axis.demon.co.uk \
--cc=rohit.seth@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.