From mboxrd@z Thu Jan 1 00:00:00 1970 In-Reply-To: Date: Wed, 12 Apr 2000 14:44:23 +0200 To: "David A. Gatwood" , linuxppc-dev@lists.linuxppc.org From: Benjamin Herrenschmidt Subject: Re: Problems with Ethernet on PowerBook Wallstreet G3 Message-Id: <20000412144423.023044@mailhost.mipsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Tue, Apr 11, 2000, David A. Gatwood 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). Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/