Problems with Ethernet on PowerBook Wallstreet G3
bh40 at calva.net
Wed Apr 12 22:44:23 EST 2000
On Tue, Apr 11, 2000, David A. Gatwood <dgatwood at deepspace.mklinux.org> wrote:
>> * Ethernet is extremely slow when SENDING data. While incoming FTP
>> traffic reaches 800...900 kB/s (which seems ok on a 10 mbps
>> network), outgoing traffic makes only 40...50 kB/s.
>Interesting. The MkLinux driver exhibits the same symptoms. Hmm... I
>wonder.... Do a side by side code comparison, and they're basically the
>same driver... *coughs* You might want to have a look at Darwin's
>drivers and see if they shed any light on this. Unless of course, that's
>just another clone.... I won't even ask....
>There are apparently occasional issues of outgoing packets getting hosed.
>Probably a DMA bug somewhere, if I were guessing, but.... I seem to
>recall the data being off by a byte in one direction or the other (i.e. a
>byte getting dropped or added), but I could be remembering wrong. It has
>been a very long time since I heard anyone mention this bug -- as in two
>years, at least.
The Darwin bmac driver contains interesting comments about chip bugs that
cause Tx packets to get corrupted in some conditions (and possibly other
issues). I didn't have time to look more closely, but for those
interested, the new kernel in Darwin CVS is the module System/xnu (not
System/kernel, this is the old kernel).
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