Report of strange TCP/IP behaviour

William Burrow (
Sat, 1 Feb 1997 12:17:03 -0400 (AST)

Sender: butenuth@lilienthal (Roger Butenuth)
Message-ID: <5cqhi6$c67$>
References: <5ci093$> <> <5clglp$>

In article <5clglp$>, (Matthew Cummings) writes:
>> In article <>,
>> Peter Mutsaers <> writes:
>> > I'm sorry, no. Face the truth: FreeBSD has indeed better networking.
>> I'm curious, could you please post your benchmarks since you seem to know
>> what you're talking about and I'm interested.

At least under some conditions Linux tcp/ip is dead slow. If you write
packets of varying size in one direction, answering every packet with
one byte, performance is bad for sizes in the range MTU + 1 to about
2 * MTU. This can be observed over ethernet or even locally. You can
download the benchmark:

I suppose some sort of bug and would be glad if it can be fixed.

Roger Butenuth
University of Paderborn
FB 17, Mathematik-Informatik
33095 Paderborn
Tel.: 05251/60-6611
Fax.: 05251/60-6619