Date: Wed, 7 Oct 1998 01:31:46 +0930 (CST) From: Kris Kennaway <kkennawa@physics.adelaide.edu.au> To: current@FreeBSD.ORG Subject: Improper sharing of modem bandwidth Message-ID: <Pine.OSF.4.03.9810070120160.32491-100000@mercury.physics.adelaide.edu.au>
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Recently I've noticed my system behaving differently during downloads; when I initiate a file download it tends to consume all available modem bandwidth, to the exclusion of all other things like open telnet sessions. Once the download has started, my telnet sessions will usually freeze (during a download of a 1.5MB file just then over my 14.4k modem I didnt get a single character back from one of my telnets open for more than 10 minutes, and another one was giving me huge delays (a minute or more, to a host which is ~400ms away under normal usage). I could also not manage to talk to the DNS (the modem dialin server) to initiate any new connections during the download; the requests were timing out. Until recently, I was not experiencing anywhere near this kind of lag during a single file transfer. This is the source of the recent comment I made here re binary transfers coming through at a faster rate than usual (1.7k, which is probably the absolute limit for my modem when you include protocol overhead). As soon as the download finishes, all other sessions return to normal within a second or two. Has anyone else seen this behaviour? I'm running behind a simple IPFW and using user-mode ppp, but have not changed any of my config for months (kernel also, beyond trivial changes). The recent bandwidth-limitation changes to ipfw flag themselves as a possible source of the problem, to my untrained eye :-) Kris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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