From: hpa@zytor.com (H. Peter Anvin)
To: linux-kernel@vger.kernel.org
Subject: Re: AES assembler optimizations
Date: Tue, 10 Aug 2004 19:51:29 +0000 (UTC) [thread overview]
Message-ID: <cfb901$ctg$1@terminus.zytor.com> (raw)
In-Reply-To: 20040809171231.GG2716@mea-ext.zmailer.org
Followup to: <20040809171231.GG2716@mea-ext.zmailer.org>
By author: Matti Aarnio <matti.aarnio@zmailer.org>
In newsgroup: linux.dev.kernel
>
> Usage of MMX inside the Linux kernel is like the usage of FP inside
> the Linux kernel: Can be done after jumping complex hoops, BUT NOT
> RECOMMENDED... (MMX in intertwined with FP hardware, after all.)
>
> You have to do lots of the MMXes in order to win after amortizing those
> necessary hoops... RAID-5 code does XOR via MMX code, under some
> conditions. ... where that happens to become a win.
>
It's not really that hard, you just have to have enough work to
amortize it over. The two metrics are: how much work do you get per
call, and how much work do you get before the next schedule().
-hpa
next prev parent reply other threads:[~2004-08-10 19:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2riR3-7U5-3@gated-at.bofh.it>
2004-08-09 14:28 ` AES assembler optimizations Andi Kleen
2004-08-09 16:02 ` Bob Deblier
2004-08-09 17:12 ` Matti Aarnio
2004-08-10 19:51 ` H. Peter Anvin [this message]
2004-08-10 20:36 ` David S. Miller
2004-08-11 1:02 ` Paul Mackerras
2004-08-11 1:25 ` David S. Miller
2004-08-12 20:18 ` Bill Davidsen
2004-08-09 18:16 ` Andi Kleen
2004-08-09 20:20 ` dean gaudet
2004-08-09 13:47 Bob Deblier
2004-08-09 14:32 ` Patrick McFarland
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='cfb901$ctg$1@terminus.zytor.com' \
--to=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.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 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.