On Wed, Sep 20, 2000 at 12:06:47PM +0200, Joachim Herb wrote:
> Hello Karim,
>
> after reading your mail about the use of the LTT together with the RTNET
> module, I would like to ask you some questions:
>
> - You wrote that the response time is <=65 microseconds. What is the
> maximal throughput over the ethernet connection? What is the maximal packet size?
> Is this the MTU value and is this value fixed or can it be changed?
65 usec is for small packets, add about 0.1 usec per byte for large packets
because of the time it takes on the wire. The MTU value is 1500, and
although some hardware supports larger packets, I wouldn't try.
The maximum throughput is theoretically 100 Mbit/sec. This can
actually be achieved on a full-duplex line. If you intend
to use a non-full-duplex line, you need to have some kind of
time-division protocol on top of rtnet, which will decrease
throughput significantly.
> - I asume that the interrupt of the network card is handled as a realtime
> interrupt (by RTAI) and not as a normal linux interrupt. (It's shown this
> way in your screenshot) Is this correct? Does the response time (or the
> throughput) change under load?
yes, no.
> - When will your network card drivers be released? Do you (or anybody here
> on the list) know when the next version of the RTNET module will be
> released (and what cards will be supported)?
ftp://ftp.lineoisg.com/pub/rtnet
Working drivers are tulip and 3c59x, plus what Karim sends me in
the near future.
dave...
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