tree e434f1de89f42008020f6aa4767c0dc0b81c9e17
parent d0c05fe4448db5cbdd886186860581f736f59ae9
author Gerrit Renker <gerrit@erg.abdn.ac.uk> 1220506219 +0200
committer Gerrit Renker <gerrit@erg.abdn.ac.uk> 1220507140 +0200

dccp tfrc: Suppress unavoidable "below resolution" warning

In the congestion-avoidance phase a decay of p towards 0 is natural once fewer
losses are encountered. Hence the warning message "p is below resolution" is
not necessary, and thus turned into a debug message by this patch.

The TFRC_SMALLEST_P is needed since in theory p never actually reaches 0. When
no further losses are encountered, the loss interval I_0 grows in length, 
causing p to decrease towards 0, causing X_calc = s/(RTT * f(p)) to increase.

With the given minimum-resolution this congestion avoidance phase stops at some
fixed value, an approximation formula has been added to the documentation.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>