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

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#495

From: Lawrence Baldwin
Date: Sat, 03 Feb 2001 14:35

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"Randy S." wrote:
> 
> 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.  

Not true, Randy.  You will generally see TCP send 1 ACK for every 2
packets received (this is a general recommendation in the RFC that most
stacks follow).  If the 
incoming stream is REAL fast there may be less, but for ADSL I'd think
it would always be 1:2.


-------------------------
Lawrence Baldwin
Protocol Scientist
678-624-0924
http://www.mynetwatchman.com - I'm under attack, now what?

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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> <3A7C1319.D83BA77B@ufl.edu>

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From: Lawrence Baldwin <baldwinlSPAMMENOT@mynetwatchman.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> <3A7C1319.D83BA77B@ufl.edu>
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