Re: Ethernet performance.
On Apr 17, R. Chris Ross wrote
>
> I am quite new at the world of IP networks and have been doing
> some testing on a Debian 1.2 system and Free BSD. Last night I ran a
> test as described in one of the ethernet FAQs by running FTP on a
> file that was ~2.5Meg the rate came out at 1.09M/sec. From what I
> can tell this is quite good for 10 Base2 since this indicates a rate
> around 8Mbit/sec of data not including overhead. With no tuning at
> all it is supprising to get proformance on this order or am I faking
> my self out?
The numbers above do not look right:
The theoretical throughput on 10base2 is about 1.183 Mbytes/sec. This
number assumes some rather ideal conditions: one ACK for 22 large 1460
byte segments, no collisions, the minimun inter-packet gap of 9.6 ms, 64k
windows, and no delays for either sender or receiver transitions (that is
no TCP/IP delays).
throughput = (22*1460bytes)/(22*1538+84bytes) *
(10,000 bits/sec)/(8bits/sec) =
= 1,183,667 bytes/sec
--
Ioannis Tambouras
ioannis@flinet.com, West Palm Beach, Florida
Signed pgp-key on key server.
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