SACK retransmit single packet although ack announces multiple gaps

刘真 glayfoofighter at
Thu Feb 14 13:06:10 UTC 2008


thanks in advance!

I am doing my test with SACK on FreeBSD 7.  When the sender receives ACKs with sack information, even if there are multiple gaps in the sack information, after 3 duplicate ACKs, the sender only retransmit 1 packet during that RTT.  
there are something may need to be set properly :

net.inet.sack.maxholes(default value :128)

but i found no instructions on how to set them, so i just keep their default values. is the performance related to these parameters, how can i set them... ? if not, who knows what would be the problem...



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