Subject: Re: gem (ERI/GEM/GMAC Ethernet device driver) has problems on macppc
To: Steven M. Bellovin <firstname.lastname@example.org>
From: Timo Schoeler <email@example.com>
Date: 10/21/2005 10:28:20
Steven M. Bellovin wrote:
> In message <4358A3E0.firstname.lastname@example.org>, Timo Schoeler writes:
>>Steven M. Bellovin wrote:
>>>In message <43589E84.email@example.com>, Timo Schoeler writes:
>>>>i said on a plain dumb SMC 10/100 _hub_ this problem appears. then i
>>>>tried the Nortel 450 (_switch) -- this runs fine in full duplex mode.
>>>>when i then manually set both the switch (managed) and the G4 to half
>>>>duplex, the problem occurs again.
>>>>when using the SMC _hub_ the machine automatically sets the NIC to half
>>>>duplex as it should be.
>>>In other words, whenver your machine is supposed to use half-duplex,
>>>you get these failures, whether the setting is manual or automatic. I
>>>don't know if it's a bug in the chip or the driver, though. I don't
>>>recall all of the details of this thread, but how do other OSs behave?
>>>Do any succeed in such a situation? If so, it's probably a driver bug.
>>> --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
>>neither Mac OS 'Classic' nor Mac OS X show those errors (for the former
>>one i have to check on the switch for CRC errors etc.). NetBSD is the
>>only OS having trouble with this.
> I think we've diagnosed the problem to some extent. I can't help any
> more, since I know nothing of this board or PPCs. I suggest you
> send-pr, including this analysis -- that it's a collision problem in
> half-duplex mode, manual or automatic -- and hope that someone who does
> know that NIC can help.
> --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
i filed a PR  -- No. 31858 -- Tue Oct 18 20:16:27 2005 and asked on
the list whether anyone has seen this, too. a thing to avoid, it seems?
 -- http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=31858