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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!spool.mu.edu!sgigate.sgi.com!imci3!newsfeed.internetmci.com!news.ac.net!news.cais.net!nntp.uio.no!nntp.uib.no!nntp-bergen.UNINETT.no!nntp-trd.UNINETT.no!not-for-mail From: sthaug@nethelp.no (Steinar Haug) Newsgroups: comp.os.linux.networking,comp.unix.bsd.netbsd.misc,comp.unix.freebsd.misc Subject: Re: TCP latency Followup-To: comp.os.linux.networking,comp.unix.bsd.netbsd.misc,comp.unix.freebsd.misc Date: 20 Jun 1996 18:41:27 GMT Organization: Nethelp Consulting, Trondheim, Norway Lines: 30 Message-ID: <4qc60n$d8m@verdi.nethelp.no> References: <4paedl$4bm@engnews2.Eng.Sun.COM> <4pf7f9$bsf@white.twinsun.com> <4qad7d$a5l@verdi.nethelp.no> <4qaui4$o5k@fido.asd.sgi.com> NNTP-Posting-Host: trane.uninett.no In-reply-to: lm@neteng.engr.sgi.com's message of 20 Jun 1996 07:28:04 GMT Xref: euryale.cc.adfa.oz.au comp.os.linux.networking:42390 comp.unix.bsd.netbsd.misc:3808 [Larry McVoy] | : So what kind of hardware is it? | | P5@133, ASUS motherboard (I can't remember the model number but it is | the really common one, pipeline burst cache), SMC 100Mbit cards using | the DEC tulip chip (nice job, DEC). | | It's a pretty cool number since Sun's was the next best at 280 on a pair | of Ultrasparcs - CPUs that have about 2x the integer perf of the P5s. | I would imagine that Linux on the ultras would get that number down to | about a 140 usecs or so round trip. I see similar effects here. Tried a test varying only *one* side. A P133 running FreeBSD 2.2-960501-SNAP, against an AMD 5x86-133 overclocked to 160 MHz, running either Linux 2.0.0 or FreeBSD 2.2-960612-SNAP. 21140 card at both ends, but running at 10 Mbit/s not 100 (might try the 100 Mbit/s a bit later tonight). The numbers I got with lat_tcp (I assume that's the one you used :-) were: Pentium local 250 usec AMD Linux local 330 usec AMD FreeBSD local 350 usec AMD Linux -> Pentium 420 usec AMD FreeBSD -> Pentium 520 usec So the difference is quite noticeable. Wish I had another P133 here to test with, but unfortunately I don't. Steinar Haug, Nethelp consulting, sthaug@nethelp.no