Date: Mon, 06 Nov 2000 22:48:18 +0000 From: Brian Somers <brian@Awfulhak.org> To: "Richard A. Steenbergen" <ras@e-gerbil.net> Cc: Kris Kennaway <kris@FreeBSD.ORG>, David Greenman <dg@root.com>, freebsd-net@FreeBSD.ORG, brian@Awfulhak.org Subject: Re: tcp sendspace/recvspace Message-ID: <200011062248.eA6MmJT13763@hak.lan.Awfulhak.org> In-Reply-To: Message from "Richard A. Steenbergen" <ras@e-gerbil.net> of "Sun, 05 Nov 2000 21:08:00 EST." <Pine.BSF.4.21.0011052058120.306-100000@overlord.e-gerbil.net>
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> On Sun, 5 Nov 2000, Kris Kennaway wrote: > > > Perhaps it was a bug, but I used to see e.g. FTP transfers which were > > running at full speed totally monopolizing my modem bandwidth (then a > > 14.4k), and other sessions not being able to receive their "fair > > share". Tweaking net.inet.tcp.recvspace to give only a second or two > > worth of data transfer reduced the latency to acceptable levels. > > > > Maybe this has been fixed by now - I haven't noticed it since I > > upgraded to a 56k modem. I'll try increasing my system to 32768 > > and see if it has any effect. > > Interesting... Most likely thats just the effect of having a slow speed > link which takes a long time to serialize data. Especially if you have > large packets, they will monopolize the time on the link and make > interactive sessions painfully sluggish. This is where WFQ comes in handy. > > Sounds like what you were doing was intentionally tuning down the > performance to sub-optimal so that it wouldn't be lagged. Intelligent > queueing seems like a better solution, but turning the socket buffer to > 32768 should have no negative impact. If fair queueing is used with ppp, ``set ifqueue 0'' is probably a good idea too - to stop ppp from getting in the way. > -- > Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/humble > PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6) -- Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org> <http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org> Don't _EVER_ lose your sense of humour ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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