netdev - Re: [patch sungem] improved locking

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Date:	Wed, 13 Dec 2006 14:12:13 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Eric Lemoine <eric.lemoine@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [patch sungem] improved locking

Been hitting a raw throughput in both directions plus a few other things
on a dual G5 and the driver didn't crash :-)

I'm seeing a problem though but I'm not sure it's related to your patch,
I'll have to test without it.

Basically, if I use a slightly modified versio of tridge's socklib (raw
xput test, basically, a tcp connection with one side pushing as fast as
it can a known pattern and the other one just receiving and verifying
the data integrity), it works fine when running only one side (either rx
or tx, doesn't matter).

But if I start it both ways (that is both a receiver and a sender on the
GMAC box) and the other end is a tg3 (quad g5), then I'm getting a lot
of eth0: RX MAC fifo overflow smac[02045822 but there are other numbers
here every now and then] errors on the sungem side.

David, could that be the pause stuff not working properly ?

The link is gigabit and the tg3 side doesn't complain about anything.

Ben.

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