On Mon, Sep 27, 1999 at 04:23:45PM +0200, David Olofson wrote:
> I'd like to see some more figures on actual transfer rates and latencies
> that
> can be achieved with RTLinux drivers.
Here's some latency numbers for the RT networking stuff that I'm
doing. The numbers aren't very good, but the code is in the "Make
It Work Right" stage, and not tuned.
Computer 1: Pentium 90, 3c905b 100baseT NIC, Linux-2.2.10-rtl11
Computer 2: dual-P150, 3c905b 100baseT NIC, Linux-2.2.10-rtl11 (running
single processor, 'cuz it crashed otherwise)
connected by a 100baseT crossover cable
I'm getting round-trip times for ~60 byte UDP packets of consistently
less than 500 us for 100 million packets over 14 hours. This number is
from RT task to RT task on the other computer and back using a simple
UDP echo server (port 7).
I have good reason to believe that with faster computers, the round trip
time should be less than 100 us. Theoretically, it could be even as the
25-50 us range, but this might require significant hacks. I get ping times
between a PII-400 and PPro200 (i.e., faster computers) of 0.1 ms with
normal Linux networking.
As for bandwidth, haven't tested it.
dave...
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