At 9:32 PM +0100 11/13/99, Steffen Barabasch wrote:
>You'll never get 1MB/s over a 10BT connection, forget this math.
>That would be same as if I'd go to the US and wonder why all your
>cars are driving at a max of 65 mph though they were capable of
>driving about as twice as fast... it just doesn't work!
Not quite the same thing. I've gotten 1 MB/s over 10Base-T many a time.
>Usual transfer rates on 100BT are about 20-30 mbit/s, far away from
>the 10 times as good connection speed you could expect from
>comparing "10BT" to "100BT".
Actually, just the other day I got 10.25 MB/s over 100Base-T. That's
pretty good, since the maximum theoretical throughput of a 100
megabit link (assuming no overhead) is 12.5 MB/s.
How, you ask, does he do this? Well, for one thing you can't use
AppleShare over AppleTalk and expect to see decent transfer rates.
300-400 KB/s is about all you can expect out of AppleShare over
10Base-T. AppleTalk is not a terribly efficient network protocol.
When I got 10.25 MB/s, I was using FTP to transfer files between two
Linux boxes. They were both connected to the same 100Base-T switch
(not a hub). To get this kind of throughput, a switch is a
necessity. If you have a hub, performance drops due to collisions.
You also, of course, must have drives on both sides which are capable
of sustaining a transfer rate that fast.
One way of getting better network file sharing performance on MacOS
is to use AppleShare IP, which uses TCP/IP instead of AppleTalk.
Another is to use something like Timbuktu. Timbuktu is capable of
saturating a 10Base-T link, but peaks at about 6 MB/s or so on
100Base-T.
>I had transfer rates on a peer-to-peer connection between a PCI
>PowerMac and some PCs of about 600-700KB/s, so the 300-400KB/s I get
>with the Duo are pretty good considering the older architecture. I
>never said that the NuBus board doesn't slow down the rates, I said
>it won't slow down a cable modem to less than 25K/s just because of
>the Ethernet transfer rate.
Actually, I would expect that (given the right software) a 68K NuBus
Mac can saturate 10Base-T. Maybe not an 030, but an 040 should be
capable.
Tim Seufert
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