Date: Tue, 18 Feb 1997 12:03:01 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hackers@freebsd.org Cc: matt@3am-software.com Subject: 21140-AC (if_de.c) news Message-ID: <199702181103.MAA06269@labinfo.iet.unipi.it>
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A few more data points about the 21140A/21140-AC (if_de.c) driver
I worked on 2.1.6 using both the stock driver ("old") and the latest
netbsd driver ("new"), using a 100Mb/s net and diskless clients.
The old driver works fine with 21140-AB board, but does not recognize
the 21140-AC correctly.
The new driver works better with the 21104-AC but has some bugs:
BUG #1:
The new driver fails to initialize the media properly on the
21140-AB (aka 21140). In the new driver, media initialization is
delayed and occurs (I think) at the first transmission attempt. The
fix is unknown (to me). As a consequence I could not use the new
driver with the 21140-AB
BUG #2:
The new driver fails to deal with too many back-to-back packets.
The first symptom for me was that NFS-mounting with blocksize of 8K
would fail, and it only seems to work with blocksize of 1K up to
about 1500. Note, in the latter case the packet is fragmented in
two pieces.
I tried to ping the diskless client with blocksize of up to 8100
bytes, while running tcpdump on the sender, and it seems to respond
correctly. HOWEVER, as soon as I ran tcpdump on the client, pinging
with more than some 4100 bytes caused failure to reply: tcpdump on
the client shows the packets coming in, but no reply going out.
I believe this is a symptom of lack of buffers somewhere. Kind of
strange, since the relevant parameters (TULIP_RXDESCS etc.) appear
to be unchanged.
Luigi
-----------------------------+--------------------------------------
Luigi Rizzo | Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it | Universita' di Pisa
tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/
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