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My understanding is auto-negotiation wasn't in the 10/100 specs so is =
was
poorly implemented.
It is part of spec for GigE. Most GigE do 10/100 as well so I guess we =
have
some kind of standard now.

jim

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of William
Enestvedt
Sent: Wednesday, June 30, 2004 5:58 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] max throughput of 20 Mbit per sec to tape ...


I saw Samuel Coco's suggestion to Rob DeLanghe to consider his SUn's =
network
link, and the advice not to auto-negotiate.
   I would like to point out that, while this has always been my =
experience
on Suns, too, recently I have heard from Sun support staff that the =
newer
ethernet controllers (e.g., dmfe) are "better" and should be allowed to
autonegotiate.
   Of course, any failures are still due to the switch. (Naturally.) And
when I remind the phone guys about Sun's old position of "only suckers
autonegotiate" and how it's still all over their InfoDocs and support =
site,
I can hear feet shifting under the chair and a lot of throat-clearing. =
:7)
   I snorted derisively the first time they told me this -- but I have
recently experienced a rash of half a dozen different Sun Fire V100s =
whose
dmfe NICs have dropped to half-duplex despite being forced at the switch =
and
via the /platform/(I_forget)/kernel/drv/dmfe.conf file. Since setting =
one to
autonegotiate, its problem has gone. [Last night, though, on a
freshly-patched V100 running Solaris 8, the dmfe dropped to half-duplex =
the
very second the NBU job kicked off!]
    So, I, too, am reconsidering the old received wisdom of never
autonegotiating, and experimenting with it. -wde P.S. Rob, play with the
buffer sizes before you do anythying else. Search the Media Server's =
logs
for messages about waiting for an empty or a full buffer, and you'll =
know
which way to go. A 280R should be able to keep up with an L25: I have a =
li'l
V120 driving an L25 with a single SDLT 220 drive in it, and I usually =
get a
good 10 Mb.
--
Will Enestvedt
UNIX System Administrator
Johnson & Wales University -- Providence, RI

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

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