[rescue] SunFastEthernet questions

Curtis H. Wilbar Jr. rescue at hawkmountain.net
Tue Sep 2 21:03:50 CDT 2003

So,  let me make sure I understand you...

Even if my hme and my autonegotiated switch negotiate at 100baseTX full
duplex (and never waver from that), the fact that the hme is in auto
negotiate is going to degrade my performance ?

This doesn't make sense to me (I'm not saying that you are wrong,
just that it doesn't make sense).  What could possibly be cuasing
a degradation in performance if negotiation has locked in at 100 full
and stayed at 100 full (with no error rate).

I also don't know the performance in my case of the Solaris for Intel
drivers for the ethernet card in my Solaris for Intel server (3COM 3C905).

I've heard the older cards (Big Mac (bmac)) had less performance (at
least under Solaris).

-- Curt

>From: "Jonathan C. Patschke" <jp at celestrion.net>
>On Tue, 2 Sep 2003, Curtis H. Wilbar Jr. wrote:
>> >And after setting them to 100/full you'll probably get about double that.
>> They are at 100/full via autonegotiate... I checked my 2924XL.. there
>> are three ports in use currently... and all are at 100/full.
>Yes.  Same situation here.  What do you expect it to tell you?
>HME is -not- -reliable- in autoneg mode.  This is a very well-known
>problem.  It will work, yes, but the connection doesn't approach its
>full potential throughput.
>> >FTP is a good benchmark because it uses TCP streams and relatively
>> >little CPU.
>> Yes, but isn't the protocol exchange got more overhead and smaller
>> transfers than other protocols ???
>Okay, HTTP, then.  Pick a protocol, any protocol.  For the purpose of a
>"is it faster after I tinkered with things?" experiment, the actual
>protocol doesn't matter.  My 100baseTX network can move data faster
>than 4.6M/s via FTP.  When things were set to autoneg, it could not.  In
>fact, the performance I saw was below that mark.  YMMV, but I've seen
>this consistently wherever hme cards are involved.
>Jonathan Patschke   )  "Gamer weenies...are the sludge at the bottom
>Elgin, TX          (    of the user swamp."           --Gary Nichols
>rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Curtis Wilbar
Hawk Mountain Networks
rescue at hawkmountain.net

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