If you are basing it on throughput, then multiply throughput by 40% of your
apparent speed. TCP/IP on Ethernet has about 40% efficiency. IBM reps at a
meeting on connectivity not long ago said that IBM made a mistake supporting Token
Ring because they saw it as needed for future bandwidth uses. They underestimated
what the inexpensiveness of the 40% efficient Ethernet would drive the Engineers to
do. Now we have 10MHz, 100MHz, 1 GHz, and they are talking about 10GHz.
MACs make good computers for Beowulf systems. See
www.blacklablinux.com. The beauty is that those parallel processing machines in a
cluster do not all have to be the same platform. Could get messy having to use cvs
rather than rpm to update all those nodes from your worldly computer, though.
Sean McMains wrote:
> Hee hee. No Beowulf here, yet. My other machines are Macs.
>
> I understand how the switching and partitioning works, and wasn't basing my
> observations on throughput, but rather on the "10/100" light on my hub.
> (Amber for 100, green for 10.) I'll root around a bit and see what I can
> discover. Thanks for all the help!
>
> Sean
>
> > Thinking of building a Beowulf are we?<g>
> >
> > OK your 100 machines are likely to talk to each other at 100, but only at 10
> to
> > the 10s. If all your equipment were 100, then it would be indicative of a
> problem
> > to see 100s running at 10.
> >
> > 3Com are usually solid cards. My main problem with them has been "short
> > fingers." Apparently they have discovered how to use less gold on the
> contacts,
> > by making them just slightly shorter, or so my calipers say. This leads to
> > non-recognition and/or intermittents unless your case is NOT warped and the
> tech
> > assembling the machine took a little extra care seating the cards.
> >
> > The 3Com Drivers are very mature and unlikely to be the source of problems.
> The
> > Dell case is to others what a tank is to automobiles, so case warpage is
> unlikely
> > to be a problem. Ummm, might try reseating the card. You may see it on
> > autodetect as a 3C590 or 3C905 ... those are both 10/100 types. Both those
> are
> > PCI types If it is an ISA card, well.... You have an issue with the salesman.
> >
> > Civileme
> >
> > Sean McMains wrote:
> >
> >> I've got two machines running at 100, three running at 10. The hub is a
> >> 10/100 switch. The card is whatever came in this used Dell I got. Lemme
> >> see...it's a 3Com of some sort. Is that any help? Is there some place to
> >> look for Ethernet card settings?
> >>
> >> Sean
> >>
> >> > Well, what is the rest of the network running at? Is the hub capable of
> 100?
> >> > What about the other machines?
> >> >
> >> > Which card is it? Many have autoswitching capability but not all.
> >> >
> >> > Civileme
> >> >
> >> > Sean McMains wrote:
> >> >
> >> >> Hi Folks,
> >> >>
> >> >> When I first fired up the machine, Linux detected the Ethernet card and
> used
> >> >> it fine. The card was sold to me as a 10/100BT, but Linux is only using it
> >> >> as a 10. Is there some setting I should fiddle with, or was I misled?
> >> >>
> >> >> Thanks in advance for any info!
> >> >> Sean
> >> >
> >> > --
> >> > Rejoice, the wait for Windows 2000 is over!
> >> > http://www.ms-windows-2000.com/
> >> >
> >> >
> >> >
> >> >
> >
> > --
> > Civileme Say:
> >
> > "He who buys Pentium III had lots of bucks"
> >
> >
> >
> >
--
Civileme Say: "Are we techs or warlocks? Let's go arm ourselves with
knowledge!"
