Re: cable guy "vapor"-izes DSL 3X cable TV troll!

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#494

From: Randy S.
Date: Sat, 03 Feb 2001 14:18

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James Knott wrote:

> A while ago, when John first posted that link, I read the
> article.  One thing I found puzzling, was the formula used
> implied a larger data packet would worsen the situation,
> even though it would require fewer acks.  I posted a note
> here to John about that, but he didn't reply to my question
> on it.  If the data packets were, for example 20 times the
> size of the acks, you should theoretically be fine with a
> 20:1 down/up ratio.

You have to look at typical data streams.  The MAX ratio of data packet to Ack is 23:1,
because an Ack is 64 bytes and a max size Ethernet Packet is 1500 bytes, and of course
you'll average significantly less than that..  It doesn't matter anyways, because the TCP
receive window is set to send Acks based on the number of bytes received, not the number
of packets.  The TCP receive window can be set as low as 8K or as high as 128K, but
typically it is set to 32 or 64K for high bandwidth home connections.

Randy S.

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<3A648E27.6A7029EF@erols.com> <20010116192016044.AAA95@adsl-209-204-185-87.sonic.net@john.navasgroup.com> <3A64B680.2A79F24D@erols.com> <3A76B6CA.73B36B26@mynetwatchman.com> <4OGd6.100$mW6.5202@typhoon.sonic.net> <3A776B57.C495242C@mynetwatchman.com> <R3Ld6.144$mW6.6010@typhoon.sonic.net> <3A782325.2538A5E2@mynetwatchman.com> <diEe6.142$Tf1.5347@typhoon.sonic.net> <3A7B357B.3C2C1C79@ufl.edu> <S4Ke6.163$Tf1.6485@typhoon.sonic.net> <3A7B76D4.AA1FFC9F@ufl.edu> <3A7C0C9E.446C8023@home.com>

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Subject: Re: cable guy "vapor"-izes DSL 3X cable TV troll!
References: <3A648E27.6A7029EF@erols.com> <20010116192016044.AAA95@adsl-209-204-185-87.sonic.net@john.navasgroup.com> <3A64B680.2A79F24D@erols.com> <3A76B6CA.73B36B26@mynetwatchman.com> <4OGd6.100$mW6.5202@typhoon.sonic.net> <3A776B57.C495242C@mynetwatchman.com> <R3Ld6.144$mW6.6010@typhoon.sonic.net> <3A782325.2538A5E2@mynetwatchman.com> <diEe6.142$Tf1.5347@typhoon.sonic.net> <3A7B357B.3C2C1C79@ufl.edu> <S4Ke6.163$Tf1.6485@typhoon.sonic.net> <3A7B76D4.AA1FFC9F@ufl.edu> <3A7C0C9E.446C8023@home.com>
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