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List:       netfilter
Subject:    RE: Pings phenomen :)
From:       "Jason Opperisano" <Jopperisano () alphanumeric ! com>
Date:       2004-08-28 22:54:21
Message-ID: D5C9032B2B09C64EA2409D6214E91AC90512FC () asimail2 ! alphanumeric ! com
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> Hi
> 
> I have 512/128 adsl. I wonder why, when I download files at full
> speed, pings to site X are about 2000ms. But when I upload files at
> full speed, pings to X are about 3000 to 5000ms. Can someone explain
> this to me from tcp/ip point of view? ;)

it has to do with the relative sizes of input and output queues setup by your ISP on \
their access devices and how uploads prevent the empty ACK packets associated with \
your downloades from getting through, which forces the TCP window size to get scaled \
down to a crawl.  i can't find a decent explanation of this at the moment, but you \
can check out:

	http://lartc.org/wondershaper/

for a solution.  it works like a charm.

-j


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