From: "Richard B. Johnson" <root@chaos.analogic.com>
To: Lucas Nussbaum <lucas@lucas-nussbaum.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ne2k-pci uncorrectly detecting collisions ?
Date: Wed, 5 May 2004 09:00:50 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.53.0405050855290.16355@chaos> (raw)
In-Reply-To: <20040505123532.GA3011@blop.info>
On Wed, 5 May 2004, Lucas Nussbaum wrote:
> Hello,
>
> I have experienced problem with the ne2k-pci driver. The symptoms were
> extremly poor performance with TCP. After some investigations, I believe
> it might be caused by problems with detecting collisions.
>
But software doesn't detect collisions. It just records what
hardware said it did. It looks like you have a 10 Mb/s card
on a 100 Mb/s network. The collisions reported are how the
hardware throttles the difference in physical-link speed.
It is possible that software didn't initialize a 100 Mb/s
device and instead initialized it to 10 Mb/s, but you
don't have any evidence of that presented.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.26 on an i686 machine (5557.45 BogoMips).
Note 96.31% of all statistics are fiction.
next prev parent reply other threads:[~2004-05-05 13:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-05 12:35 Lucas Nussbaum
2004-05-04 12:55 ` backblue
2004-05-05 13:00 ` Richard B. Johnson [this message]
2004-05-05 13:10 ` Lucas Nussbaum
2004-05-05 19:45 ` Denis Vlasenko
2004-05-06 9:52 ` Lucas Nussbaum
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