Re: Ethernet problem on 7200

Re: Ethernet problem on 7200

[bob]

User Bruce Anderson says:
> On Wed, Aug 2, 2000 11:03 PM, bob@kunk.jriver.com
> <mailto:bob@kunk.jriver.com> wrote:
> >
> >The driver problem I'm having with the MACE is NOT the one described
> >below or in the apple article. I have the problem on 2 different
> >motherboards, on a 75 and one a 90. BOTH have the "missing" clock
> >hardware. I've also see it on another. The packet size doesn't matter,
> >sometimes it dies on pings (64 bytes). It works PERFECTLY in MacOs.
> >
> >Bob
> >
>
> The missing clock hardware also affects PCI bus timing and devices
> on the PCI bus. Apple has a INIT that tries to fix the problem.
>
> 2.2.13 kernel works for me.
> Next time you have a problem
> Write down the bogomips and see if it changes over boots.
> Next time you have a problem you might see a change.
> That might be a clue that the kernel is geting the
> software delay timing wrong.

I'm sorry that my comment wasn't very clear, both of my 7200's HAVE the
clock hardware (according to the til). A 20 mhz can right next to the
ethernet chip and the 50 pin scsi connector.

So... the problems still appear to be in the drivers.. When I get some
time I'm going to move from a switch to a hub and put tcpdump on another
machine to see what's up when the mace stops working. In previous testing
it appeared that the 7200 was ignoring the INCOMING packets. We'll see...

Bob
--
Robert E. Brose II    N0QBJ
http://www.jriver.com/~bob/
bob@kunk.jriver.com

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Ethernet problem on 7200

[bob]

For some unknown reason, I had trouble getting this message to post. Here
is is without the Re: in it. It is related to a number of problems I
and other uses have been having with mace and 53c94 drivers on various
PowerMac 7200's.


> It's been my experience with several machines that the mace driver doesn't
> work most of the time on the 7200.
>
> Not sure why. The stats are useless. I've tried it with the built-in
> RJ45 and with the AAUI to TP transceiver as well. I'm pretty certain it
> isn't a duplex problem. It appears to be dropping incoming packets.
>
> Only thing you can do (other than fix it ;) is to put in a PCI ethernet
> card. I can tell you that most any tulip (21xxx) based card will work as
> well as the ne2k-pci clones (realtek, etc chips).
>
> It a bummer for me as I'm out of slots and I need to add a decent scsi card.
>
> The 53c94 scsi driver appears to have serious problems on the 7200 as well.
> I can't even write a CD at 1x with it without the fifo emptying even
> with a big buffer and less than 50 megs of data! It looks like it
> may not be doing disconnects properly, the raw speed is OK when testing
> with iozone it's only about 40% slower than a controller in the
> PCI slot. However when it has to wait for the CDwriter to do something
> that doesn't return right away, it just appears to hang the machine.
> Eventually it comes back when the writer is finished (i.e. fixating).
> (no it's not the cable).
>
> If I take out one of the ethernet cards and put in a 2940 I can write at 4x
> without the buffer getting less than 98% full!!! Heck, my 68k performa
> can write at 4x in MacOs.
>
> I've tried this with a bunch of kernels and am currently running the
> 2.2.17pre7 version.


Bob
--
Robert E. Brose II    N0QBJ
http://www.jriver.com/~bob/
bob@kunk.jriver.com

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