Re: Flaw in 3c59x.c or in Kernel?

From: Jonathan Poole (jpat_private)
Date: Wed Jan 05 2000 - 11:03:14 PST

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Maybe in reply to: Sonny Parlin: "Flaw in 3c59x.c or in Kernel?"
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I have found that it's a problem in the original 3c905 NIC, and the 3com
905B, I seem to have resolved my issues with buying a 3com905C.

I found that the HARDWARE not the software, is broke with 905B's (IE can't
handle cross over, and doesn't negotiate properly), However Setting the
Ethernet MTU's at 1477 was probably tyhe base of my issue (Yes, I am a
PppoE lewser, from annoying uplink sympatico.ca that forces pppoe)

I think this not necessarily a driver issue, but a hardware issue.  The
revisions on the NIC's have been changing, and it would be a great card,
if it was originally introduced as a 905C, not a B or original.

Jonathan Poole.

On Wed, 5 Jan 2000, Sonny Parlin wrote:

> The only problem I have with ifconfiging down/up is that every time I've run
> my test, the machine completely locks, no keyboard, no nothing... So
> ifconfig is not an option at that point. Unfortunately, when it crashes, it
> crashes BIG. Also, I should have mentioned in my first mail that when using
> the 3com driver, this problem goes away. I haven't had a chance to look at
> the differences yet, but I'm sure someone will now..   I don't believe the
> 3com driver ships with any distros (well, at least not redhat), so it's
> still a pretty serious problem to consider.
>
> -Sonny
>
> -----Original Message-----
> From: dwmaloneat_private [mailto:dwmaloneat_private]
> Sent: Wednesday, January 05, 2000 5:43 AM
> To: Sonny Parlin
> Cc: BUGTRAQat_private
> Subject: Re: Flaw in 3c59x.c or in Kernel?
>
>
> On Tue, Jan 04, 2000 at 09:21:36AM -0500, Sonny Parlin wrote:
>
> > eth1: Too much work in interrupt, status e481. Temporarily disabling
> > functions(7b7e).
>
> We saw this with some Linux machines in college that were connected
> to busy 100Mb/s ethernet. Bill Paul is right when he says ifconfiging
> down and then up fixes the hang. To work around the problem we changed
> max_interrupt_work from 20 to 200 and I don't think they've seen any
> hangs since. (You can find this in the .c file for the driver).
>
> These machines were also seeing hard lockups - keyboard stopped
> responding. This seemed to stop too when we upped this variable.
>
> 	David.
>

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