Odd ethnetnet problem

bob at kunk.jriver.com bob at kunk.jriver.com
Fri Aug 6 14:53:42 EST 1999

I have an iMac with the usual builtin  bmac ethernet controller. It is on a 
10 mb hup with a couple of other boxes (one professional svr4 and one linux
2.2.10 on intel)

The hub is a generic dumb 10mb half duplex only unit. The problem is this,

When the iMac talked to either Unix box from MACOS, I would get
nearly 100% of the bandwidth of the ethernet on put's and get's.

When the iMac talked to either Unix box from linux-ppc (several kernels
tested), I would get nearly 100 percent on receive but REALLY slow
response on transmit (like about 40k/sec). Watching the lights on the hub,
it appears that there is a really big delay restarting transmit after
a collision occurs. Perhaps duplex set wrong?

Since it works fine in MACOS, I looked over the linux driver and didn't see
anything obviously wrong. Has anyone else run into this before? 

Robert E. Brose II    N0QBJ
bob at kunk.jriver.com

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