Re: [2.2.9] performance problem on 100MBit network

M.Brands (shrike@il.fontys.nl)
Thu, 27 May 1999 10:50:18 +0200

On Mon, May 24, 1999 at 12:58:13AM -0700, David S. Miller allegedly wrote:
> Date: Sat, 22 May 1999 16:08:30 +0200
> From: Jochen Heuer <jogi@planetzork.ping.de>
>
> Sometimes I get ping times of up to 20 seconds(!) while normaly
> ping times are ~0.3ms. If this happens I have to reboot either my
> server or my client.
>
> What can I do to debug this if it happens again?
>
> Let me guess, you see this behavior on systems where DHCP is running
> in some way? And it happens about when a client rebinds, and the
> machine in question is going ARP crazy if you watch it on the network
> with tcpdump?
>
> Did I guess right?

I have similar problems with two DEC Tulip cards running at 100 mbit
full-dupex. I'm currently using the de4x5 driver and when one of my
machines needs to reboot, the other switches to 10 mbit. When the
other machines comes back up again, it does switch backup to 100 mbit,
but the connection is completely screwed up (I've seen pingtimes of up
to 6000 sec!) Both machines start issuing ARP request for each other,
but get no reply. I've had this both with 2.0 and 2.2 kernels, so I'm
guessing it's not a kernel issue. It is very annoying though. I should
probably force both cards to one medium...

Mathijs

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