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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!newsfeed.direct.ca!hunter.premier.net!newsfeed.internetmci.com!news.mathworks.com!news.kei.com!news.texas.net!news1.best.com!news.aimnet.com!news.walltech.com!news.ecis.com!news.zeitgeist.net!usenet From: "Amancio Hasty Jr." <hasty@star-gate.com> Newsgroups: comp.os.linux.networking,comp.unix.bsd.netbsd.misc,comp.unix.bsd.freebsd.misc Subject: Re: TCP latency Date: Fri, 12 Jul 1996 11:20:55 -0700 Organization: TLGnet Inc., (formerly The Little Garden) Lines: 50 Message-ID: <31E69787.41C67EA6@star-gate.com> References: <4paedl$4bm@engnews2.Eng.Sun.COM> <31E106AF.41C67EA6@dyson.iquest.net> <4rvmtf$ven@linux.cs.Helsinki.FI> <31E3D9E2.41C67EA6@dyson.iquest.net> <4s5bl2$qpg@linux.cs.Helsinki.FI> NNTP-Posting-Host: rah.star-gate.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b3 (X11; I; FreeBSD 2.2-CURRENT i386) Xref: euryale.cc.adfa.oz.au comp.os.linux.networking:44989 comp.unix.bsd.netbsd.misc:4007 comp.unix.bsd.freebsd.misc:23392 Linus Torvalds wrote: > > linux$ ./lat_tcp linux > $Id: lat_tcp.c,v 1.2 1995/03/11 02:25:31 lm Exp $ > TCP latency using linux: 181 microseconds > > That's on a P166 too. With a stable kernel. What were you saying > again? Can you also post your OS version ? > (And if you think you will get 10% better numbers by just changing > compiler options, I'd suggest you _try_ it first, without spouting it on > the newsgroups as facts with no backing). > Well I could ask Dyson to compile in the Pentium optimized bcopy 8) > And if you don't like latency numbers, what are your throughput numbers? > (Btw, check your bcopy() speed first to see if the hardware really _is_ > comparable, see below) > > linux$ ./bw_tcp linux 50m > $Id: bw_tcp.c,v 1.3 1995/06/21 21:02:49 lm Exp $ > Socket bandwidth using linux: 17.14 MB/sec > > Yes, the machine was idle while doing this. I guess you can just do them > (This machine does memory copies at 43MB/s - don't bother comparing to Wow 43MB/sec isnt the PC something. At least is good enough to watch TV and hack 8) > wildly different hardware: it's memcpy() bound. I get 55MB/s on my > alpha with the same kernel) In addition I would like to know your system configuration : motherboard brand memory speed -- Amancio Hasty Hasty Software Consulting Services Tel: 415-495-3046 Fax: 415-495-3046 Cellular: 415-309-8434 e-mail: hasty@star-gate.com Powered by FreeBSD