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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!news.hawaii.edu!news.uoregon.edu!arclight.uoregon.edu!usenet.eel.ufl.edu!gatech!news.cse.psu.edu!rutgers!utcsri!cs.toronto.edu!schenk Newsgroups: gnu.misc.discuss,comp.os.linux.networking,comp.unix.bsd.netbsd.misc From: schenk@cs.toronto.edu (Eric Schenk) Subject: Re: TCP latency X-Nntp-Posting-Host: qew.cs.toronto.edu Message-ID: <1996Jun11.005901.9524@jarvis.cs.toronto.edu> X-Newsreader: NN version 6.5.0 #8 (NOV) References: <1JWBCFZN@wuschel.ibb.schwaben.com> <4p4vfv$rev@top.mitre.org> <4p7cne$2ri@linux.cs.Helsinki.FI> <4pa83i$2km@solutions.solon.com> <4pe4fo$7gi@linux.cs.Helsinki.FI> <4paedl$4bm@engnews2.Eng.Sun.COM> <4pf7f9$bsf@white.twinsun.com> Date: 11 Jun 96 04:59:01 GMT Lines: 29 Xref: euryale.cc.adfa.oz.au gnu.misc.discuss:26270 comp.os.linux.networking:41279 comp.unix.bsd.netbsd.misc:3754 eggert@twinsun.com (Paul Eggert) writes: >I agree. It's a popular problem area these days. For another example, >see <URL:news:4paedl$4bm@engnews2.Eng.Sun.COM>, where Sun announces >fixes to severe problems with Solaris 2.5 (and 2.5.1) TCP performance >when communicating over slow links. (In our case, the intervening node >was a Cisco terminal server, but it wasn't Cisco's fault.) BSD and >Linux networking implementers should read that news article; it >describes some entertaining gotchas. This article was interesting reading. Thanks for pointing it out. I probably would have missed it otherwise. The problems and solutions that they describe are interestingly similar to the series of problems with TCP that I discovered and fixed during the Linux 1.3.X development cycle. There are also some issues that they mention that we should defintely keep in mind for future development. In particular, the problems that they had with caching the previous RTT in the routing table should be kept in mind when we get around to implementing this for Linux. I'm going to save a copy of this article, and I'd recommend that the other Linux networking developers do likewise. -- eric --------------------------------------------------------------------------- Eric Schenk www: http://www.cs.toronto.edu/~schenk Department of Computer Science email: schenk@cs.toronto.edu University of Toronto