[e2e] Are we doing sliding window in the Internet?

Joe Touch touch at ISI.EDU
Tue Jan 2 18:55:05 PST 2007

Lachlan Andrew wrote:
> Greetings,
> On 02/01/07, Joe Touch <touch at isi.edu> wrote:
>> Detlef Bosau wrote:
>> > Round    CWND
>> >    1              2
>> >    2              4
>> >    3              8
>> It doesn't double each RTT; it goes up by 50%. Remember, the window
>> grows by one MSS each ACK during the initial phase, but there is one ACK
>> for each two MSS's.
> If you have ABC (as recent Linux senders do by default), or don't use


> delayed ACKs (as Linux receivers don't when the window is small),

Delayed ACKs are strongly encouraged.

Both good reasons to fix these bugs in Linux.

> Detlef was right that it doubles each RTT.

Right - noncompliant or nonstandard implementations can do various other


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