retrac@titan.rice.edu (John Carter) (11/13/87)
References: Hello, A couple of weeks ago I posted a query about what the absolute best case for tcp-ip throughput on a 10 Mbit/sec ethernet was. I didn't get many responses, but I'm very grateful for those that did reply (Thanks!). The numbers are pretty good, but for comparison purposes keep in mind that these are best case numbers and also make note of the processors on which the measurements were made (since processor speed is the dominant cost). ---- From: David Robinson <david@elroy.jpl.nasa.gov> The best I have personally seen is between two Sun-3/260's doing memory-memory transfers is 3.2Mbits/sec. Their UDP topped out at 5Mbits/sec. This was on a fairly quite net, rwhod and routed traffic only. From my experience excelan boards have been the worst, slower than my lowly Sun-2, but what can be expected from a 80186?? I do not know what the limiting factor of the Sun's is by I suspect that it is CPU bound, the e-net controllers each have large memmory buffers (256K?). -David Robinson david@elroy.jpl.nasa.gov ---- From: lekash@orville.nas.nasa.gov Better performance for ethernet is not that likely until someone builds a better interface card. Thats the current bottleneck. If you go to other media, say pronet-80, or hyperchannel, you can get much higher rates. we were seeing up to 17mbits/sec over hyperchanel, proteon claims over seven for their ring. I would guess with performance tuning, those numbers will increase. (We might even do some here.) john ---- From: nowicki%rose@sun.com (Bill Nowicki) Disclaimer: this is NOT an official number, just my latest test in an uncontrolled environment with an unannounced software configuration. But between a pair of Sun-4/260s I am able to transfer with TCP over an Ethernet at 5.0 Mbits/second. -- WIN ---- Thanks again to David, John and Bill! The next article should be a follow-up query. John Carter Rice University =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=* * UUCP: {Backbone or Internet site}!rice!retrac oo = = ARPA: retrac@rice.edu < * * CSNET: retrac@rice.edu U - Bleh. = =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*