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)
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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
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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
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