*BSD News Article 65062


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From: phys6k@menudo.uh.edu (Yan-Song Chen)
Newsgroups: comp.os.linux.development.apps,comp.os.linux.development.system,comp.os.linux.x,comp.os.linux.hardware,comp.os.linux.setup,comp.unix.bsd.386bsd.misc,comp.unix.bsd.bsdi.misc,comp.unix.bsd.netbsd.misc,comp.unix.bsd.freebsd.misc
Subject: Re: Why to not buy Matrox Millennium
Followup-To: comp.os.linux.development.apps,comp.os.linux.development.system,comp.os.linux.x,comp.os.linux.hardware,comp.os.linux.setup,comp.unix.bsd.386bsd.misc,comp.unix.bsd.bsdi.misc,comp.unix.bsd.netbsd.misc,comp.unix.bsd.freebsd.misc
Date: 4 Apr 1996 16:25:51 GMT
Organization: University of Houston
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Peter Berger (peterb@hoopoe.psc.edu) wrote:
: >>Here's one:  14% utilization of UDP bandwidth, best case.
I did not see their paper but I bet you must be wrong, either they are wrong
or you misunderstand their paper. TCP/UDP/IP implementation of linux is not
perfect, but definitely much better than 14%.
A few simple tests can show that it is not true.
1) I mount a nfs volume over 10Mbps ethernet, and copy a 1.44MB file from
nfs partition to local partition, it takes 6 seconds, about 240KB/s, hmm, 
nfs performance is not good, but definitely better than 14%. And I still
do not count any extra overhead. NFS  is built on the top of UDP, AFAIW.
2) I ftp a 7.2MB file over 10Mbps ethernet, it takes 23 seconds, about  310KB/s,
about 310K*8/10M = 25% of ethernet bandwidth. And remember that FTP is slower
than TCP and TCP is slower than UDP, AFAIW.

: These results were published at the January 1996 USENIX technical conference,
: in a paper by Kevin Lai and Mary Baker from Stanford.  I'm sure this
: paper is available on the web -- I apologize for not having a URL, but
: I'm looking at the hard copy now.  The bottom line is that Linux CPU
: performance is better than FreeBSD's (not surprising, since Linux
: is so intel-specific) but it's networking performance is, to put it
: most kindly, a joke.

: In all cases, the versions of the software tested was the latest version
: of the software which was a "production release" at that time -- no beta
: software was tested.  This is the Right Thing to do.  It is completely
: improper for anyone to recommend the 1.3.x kernels for commercial use,
: since the 1.3.x is a development tree, and is specifically promised
: to NOT be stable.


: -- 
: Pete Berger
: Coordinator, Regional Information Infrastructure
: Pittsburgh Supercomputing Center

--
yansong chen
--
YChen@uh.edu