SACK retransmit single packet although ack announces multiple gaps

[刘真]

HI; 

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)
net.inet.sack.globalholes(0)
net.inet.sack.globalmaxholes(65536)

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...

thanks!

yhen
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