Subject: Re: gem (ERI/GEM/GMAC Ethernet device driver) has problems on macppc
To: Matthias Scheler <firstname.lastname@example.org>
From: Timo Schoeler <email@example.com>
Date: 10/20/2005 11:16:56
Steven M. Bellovin wrote:
> In message <4356070F.firstname.lastname@example.org>, Timo Schoeler writes:
>>>>>Do you use hardware checksum offload?
>>>>no. it's disabled.
>>>So that's not the reason. I asked because I had it enabled.
>>>>(btw: IIRC i had the same issue on a G3 b&w in the office (this runs a
>>>>bm0 NIC then) where i put in some spare NICs (fxp) to circumvent the
>>>>problem. i'll do some reseach when i'm in the office.)
>>>Is it that bad? My G4 spilled out that message every few minutes and
>>>the network connection worked fine.
>>uhm, i thought it to be noteworthy.
>>the problem scales with the speed the packets come in/go out:
>>* downloads from an ftp server outside the LAN (connected with 4Mbps)
>>give no errors;
>>* transfers with a host in the same LAN at 10Mbps give rarely errors of
>>this kind, but they are there;
>>* transfers with a host in the same LAN at 100Mbps gives a busy syslogd...
>>the problem starts immediately, as i already noted, as soon as the ssh
>>handshaking takes place.
> That sure sounds like a collision problem. It could be the switch or
> its configuration, it could be a full/half-duplex mismatch (try setting
> that explicitl), or it could be something about the NIC or driver.
i tried this now on a manageable switch (Nortel 450):
* running in full duplex mode not a single error occurs (i used a 4GByte
file and transferred it via ftp);
* running in half duplex mode (set on the switch) shows the problem as