Instead of what RFC2581 describes, the initial congestion window is increased to 2-4 MSS:
min (4*MSS, max (2*MSS, 4380 bytes))
For the MTU of 1500 bytes, the MSS is 1460 bytes. Then the initial cwnd is 3 MSS. The initial cwnd setting is actually according to this table:
MSS | max cwnd |
---|---|
MSS \(\le\) 1095 bytes | 4 MSS |
1095 \(<\) MSS \(<\) 2190 bytes | 4380 bytes |
2190 bytes \(\le\) MSS | 2 MSS |
Bibliographic data
@misc{
title = "Increasing TCP's initial Window",
author = "M. Allman and S. Floyd and C. Partridge",
howpublished = "IETF RFC 3390",
url = "http://tools.ietf.org/rfc/rfc3390.txt",
month = "Oct",
year = "2002",
}