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From: Andi Kleen <andi@mlm.extern.lrz-muenchen.de>
Newsgroups: comp.os.linux.networking,comp.unix.bsd.freebsd.misc
Subject: Re: TCP latency
Date: 16 Jul 1996 11:05:24 +0200
Organization: Leibniz-Rechenzentrum, Muenchen (Germany)
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"John S. Dyson" <toor@dyson.iquest.net> writes:
> The results don't show a significant (micro-level) performance difference
> in general between the OSes. The most suprising results are the shell
> fork/exec results.
Maybe that's because Linux uses bash as /bin/sh. FreeBSD uses a smaller
shell (some ash derivate I think) as /bin/sh. It would be interesting to
retest with ash as /bin/sh in Linux.
It seems also that /bin/sh is statically linked on FreeBSD:
[FreeBSD 2.2 box:]
$ ldd /bin/sh
ldd: /bin/sh: not a dynamic executable
$ size /bin/sh
text data bss dec hex
266240 12288 30136 308664 4b5b8
[ with C library linked in]
[ Redhat 3.0.3 Linux Kernel 2.0.1 box:]
% ldd /bin/sh
libtermcap.so.2 => /lib/libtermcap.so.2.0.5
libc.so.5 => /lib/libc.so.5.2.18
% size /bin/sh
text data bss dec hex filename
222864 73931 4824 301619 49a33 /bin/sh
[that's without C library]
Given this facts I don't think the shell exec/fork results are
surprising. I think both FreeBSD and Linux are very good systems.
-Andi