Re: [cobalt-users] duplex question

[cobalt@xxxxxxxxxxxxxxxx]

Hello Gsh,
Yes, I've rebooted the server and it still gives collisions when in Full
duplex or half. I actually have about 8 cobalt servers that are acting
this way and I've checked all the cat 5. They are receiving collisions in
full or half duplex, even after I reboot the server so it seems something
is going on with the raq eth0 thinking it is half duplex even when the
switch is in Full duplex mode. I can't think of any other reason that full
duplex would be 10x slower than half duplex. I don't know how to force the
eth0 into full or half duplex either.

Any more info from anyone much appriciated.
Thanks for the reply Gsh!

Cobalt Man


On Thu, 26 Jul 2001 flash22@xxxxxxx wrote:

> On Thu, 26 Jul 2001 cobalt@xxxxxxxxxxxxxxxx wrote:
> 
> > Hello All,
> > I believe the cobalt raq's are supposed to auto negotiate duplex.
> > I have some raqs connected into a cisco catalyst 5500. If I have the
> > network guys set the switch to full duplex (on the raq port), I see
> > collisions on my eth0 and transfer at 70kB/sec from a solaris machine on
> > the network. When I set the switch to half duplex for the cobalt raq port,
> > the collisions continue (much faster) but I start getting 700kB/sec from
> > the solaris machine (using secure copy to do these transfers, BTW)
> > 
> > So my question is why do I see collisions either way I set the switch
> > and if raqs do auto negotiate, why is full duplex so much slower?
> 
> You rebooted the raq right? negotiation , when it works, only happens once
> at boot....(or the first packet that makes it into the interface
> thereafter)
> 
> I'd be thinking cable otherwise, the fact you have slower speed in full
> duplex on the cisco side tells me you really are having collisions, tho
> the fact you seem to have them in full/half mode makes me wonder about the
> cable more....
> 
> ps: dunno about the raq's per se, but many linux drivers can also be
> forced into full or half mode via kernel options...
> 
> gsh
> 
> 
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