From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <christoph@lameter.com>
Cc: Andi Kleen <ak@suse.de>, christoph <christoph@scalex86.org>,
akpm@osdl.org, linux-kernel@vger.kernel.org, shai@scalex86.org
Subject: Re: [PATCH] Move some variables into the "most_readonly" section??
Date: Wed, 15 Jun 2005 01:19:11 +0200 [thread overview]
Message-ID: <20050614231911.GV11898@wotan.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.62.0506141614570.23117@graphe.net>
On Tue, Jun 14, 2005 at 04:17:14PM -0700, Christoph Lameter wrote:
> On Wed, 15 Jun 2005, Andi Kleen wrote:
>
> > > Hmm. No. The bigger cpu maps may benefit from cacheline alignment for
> > > even for read access.
> >
> > Why? Can you please explain that. It doesn't make sense to me.
>
> Its more likely to get a big piece of the array in a single
> cacheline if the array starts at the beginning of a cacheline.
>
> If these maps would start in the middle of a cacheline then additional
> cacheline fetches may become necessary to scan an array etc.
But the CPUs do prefetching anyways for that. Do you have numbers
that this is actually worth it?
-Andi
next prev parent reply other threads:[~2005-06-14 23:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-07 19:58 christoph
2005-06-08 13:18 ` Andi Kleen
2005-06-14 22:54 ` christoph
2005-06-14 23:04 ` Andi Kleen
2005-06-14 23:17 ` Christoph Lameter
2005-06-14 23:19 ` Andi Kleen [this message]
2005-06-14 23:27 ` Christoph Lameter
2005-06-14 23:54 ` Andi Kleen
2005-06-14 23:23 ` Andrew Morton
2005-06-14 23:46 ` christoph
2005-06-14 23:58 ` Andrew Morton
2005-06-15 0:05 ` christoph
2005-06-15 0:16 ` Andrew Morton
2005-06-15 0:41 ` Andi Kleen
2005-06-17 13:55 ` Anton Blanchard
2005-06-27 23:17 ` christoph
2005-06-15 0:18 ` Nick Piggin
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=20050614231911.GV11898@wotan.suse.de \
--to=ak@suse.de \
--cc=akpm@osdl.org \
--cc=christoph@lameter.com \
--cc=christoph@scalex86.org \
--cc=linux-kernel@vger.kernel.org \
--cc=shai@scalex86.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®