From: jaypee@hotpop.com
To: Bruno Randolf <bruno.randolf@4g-systems.biz>
Cc: Clem Taylor <clem.taylor@gmail.com>,
linux-mips <linux-mips@linux-mips.org>
Subject: Re: Au1550 ethernet throughput low
Date: Mon, 18 Jul 2005 09:57:13 +0000 [thread overview]
Message-ID: <1121680641l.13805l.1l@cavan> (raw)
In-Reply-To: <200507151117.49012.bruno.randolf@4g-systems.biz> (from bruno.randolf@4g-systems.biz on Fri Jul 15 10:17:44 2005)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 15/07/05 10:17:44, Bruno Randolf wrote:
> On Friday 15 July 2005 10:21, jaypee@hotpop.com wrote:
> > Yours is using ~30% cpu to send 100Mbps.
> > Mine is using 100% to send 66Mbps.
>
> i remember that ethernet thruput dropped from nearly 100Mbps to about
> 60-70Mbps on our Au1500 based board, when we enabled
> CONFIG_NONCOHERENT_IO...
Thanks Bruno but I can't find that config option to select.
I did find CONFIG_
Changing from CONFIG_DMA_NONCOHERENT to CONFIG_DMA_COHERENT make no
difference, although I can see that if the kernel invalidates the cache
line for each packet on send there would be a performance hit.
Clem can you send me your .config to see if I can figure out why your
setup works?
>
> bruno
>
- --
mailto:jaypee@hotpop.com
http://www.jaypee.org.uk
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
iD8DBQFC230BZDxnKy3oOpYRAjq2AJ49DO0KrqGmWcS1N1dHHLe2lOlEhgCeNyqw
aTRA+DA6FyMNakcLBt5oV88=
=TR4O
-----END PGP SIGNATURE-----
next prev parent reply other threads:[~2005-07-18 9:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-13 16:00 Au1550 ethernet throughput low jaypee
2005-07-14 15:02 ` Matej Kupljen
2005-07-14 15:06 ` Pete Popov
2005-07-14 15:15 ` jaypee
2005-07-15 0:13 ` Clem Taylor
2005-07-15 8:21 ` jaypee
2005-07-15 9:17 ` Bruno Randolf
2005-07-18 9:57 ` jaypee [this message]
2005-07-18 12:56 ` Dan Malek
2005-07-18 13:41 ` jaypee
[not found] ` <ecb4efd105071809082628bb27@mail.gmail.com>
2005-07-18 17:25 ` jaypee
-- strict thread matches above, loose matches on Subject: below --
2005-07-14 5:02 Singh, Ajay
2005-07-14 5:02 ` Singh, Ajay
2005-07-14 13:52 ` jaypee
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=1121680641l.13805l.1l@cavan \
--to=jaypee@hotpop.com \
--cc=bruno.randolf@4g-systems.biz \
--cc=clem.taylor@gmail.com \
--cc=linux-mips@linux-mips.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