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author | Samuel Jero <sj323707@ohio.edu> | 2011-07-25 04:49:19 +0200 |
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committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2011-08-01 15:52:35 +0200 |
commit | d346d886a4c7f771c184e73833133f23a18de884 (patch) | |
tree | b30d5ea65d37af5dd49f03712ae2f973bc71553b /fs/exofs | |
parent | dccp ccid-2: use feature-negotiation to report Ack Ratio changes (diff) | |
download | linux-d346d886a4c7f771c184e73833133f23a18de884.tar.xz linux-d346d886a4c7f771c184e73833133f23a18de884.zip |
dccp ccid-2: prevent cwnd > Sequence Window
Add a check to prevent CCID-2 from increasing the cwnd greater than the
Sequence Window.
When the congestion window becomes bigger than the Sequence Window, CCID-2
will attempt to keep more data in the network than the DCCP Sequence Window
code considers possible. This results in the Sequence Window code issuing
a Sync, thereby inducing needless overhead. Further, if this occurs at the
sender, CCID-2 will never detect the problem because the Acks it receives
will indicate no losses. I have seen this cause a drop of 1/3rd in throughput
for a connection.
Also add code to adjust the Sequence Window to be about 5 times the number of
packets in the network (RFC 4340, 7.5.2) and to adjust the Ack Ratio so that
the remote Sequence Window will hold about 5 times the number of packets in
the network. This allows the congestion window to increase correctly without
being limited by the Sequence Window.
Signed-off-by: Samuel Jero <sj323707@ohio.edu>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'fs/exofs')
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