Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.bhp.com.au!mel.dit.csiro.au!munnari.OZ.AU!news.ecn.uoknor.edu!solace!nntp.uio.no!news.cais.net!news.jsums.edu!gatech!swrinde!news.uh.edu!phys6k 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 Lines: 39 Message-ID: <4k0t6f$mpm@masala.cc.uh.edu> References: <4jn4qp$6p@darkstar.my.lan> <stephenkDp7nHo.369@netcom.com> <4jrhth$66a@hoopoe.psc.edu> <4jve3t$cfe@hermes.synopsys.com> <4k0m0f$68j@hoopoe.psc.edu> NNTP-Posting-Host: menudo.uh.edu X-Newsreader: TIN [version 1.2 PL2] Xref: euryale.cc.adfa.oz.au comp.os.linux.development.apps:14144 comp.os.linux.development.system:20677 comp.os.linux.x:28559 comp.os.linux.hardware:35432 comp.os.linux.setup:49008 comp.unix.bsd.386bsd.misc:450 comp.unix.bsd.bsdi.misc:2990 comp.unix.bsd.netbsd.misc:2753 comp.unix.bsd.freebsd.misc:16641 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