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- Newsgroups: comp.protocols.nfs
- Path: sparky!uunet!cs.utexas.edu!torn!watserv2.uwaterloo.ca!watserv1!steam.uwaterloo.ca!eengelke
- From: eengelke@steam.uwaterloo.ca (Erick Engelke)
- Subject: Re: Sun <=> PC Transfer Rate (Summary)
- Message-ID: <BuFGLp.3v2@watserv1.uwaterloo.ca>
- Sender: news@watserv1.uwaterloo.ca
- Organization: University of Waterloo
- References: <karl.23.716089551@empirical.com> <BuDFv1.3n6@watserv1.uwaterloo.ca> <1072@rsp.UUCP>
- Date: Fri, 11 Sep 1992 18:56:12 GMT
- Lines: 39
-
- tom@rsp.UUCP (Thomas Ruf) writes:
- >eengelke@sail.uwaterloo.ca (Erick Engelke) writes:
- >
- >>>I've gotten as high as 5megabits/second using a 50Mhz 486DX box with a 16
- >>>bit WD board using the same software and packet driver.
-
- >>That is about the limit of the current ISA ethernet hardware and packet
- >>drivers...
- >>On a different ISA network card we get 850 KB/s, but you really start
- >>hitting the hardware bus limitations.
-
- >Can't agree here: a good Ethernet card on ISA (e.g. our LANCE based cards)
- >can saturate an Ethernet and of course also receive at the same rate.
- >If you assume that ISA has a bandwidth of
- >about 4MB/s, the CPU has still about 70% of time available for the
- >packet driver and TCP/IP protocol processing. So the limitation
- >is probably not the bus but the cpu.
-
- I'd love to see that on ISA architecture. But our experience to
- date has been that 286 machines with non-standard 12 MHz bus
- outdoes 386 machines on 8 or 10 Mhz buses when just doing packet
- i/o (ie. no processing of the data). By that I mean the kB/s
- you get doing nothing but rep outsb or rep outsw.
-
- I used to have the numbers handy for maximum and avg transfer
- rates on the various busses, speeds, etc. Though I've lost
- that data, I remember it being consistant with my claim here.
-
- If you have an ISA card and packet or ODI which can drive it at
- full Ethernet speed (with new packets, not just retransmitting
- already loaded packets), post back on this group. A lot of
- people would like to see it.
-
- Erick
-
- --
- Erick Engelke Engineering Computing
- University of Waterloo
- Waterloo TCP Architect erick@development.watstar.uwaterloo.ca
-