best practice to watch TCP parms of established sockets

Wed Feb 17 16:03:59 UTC 2010

Hello,

while doing some ZFS tests with RELENG_8 I recognized a mysterious 
performace drop after an hour uptime.
Now my first idea is to compare MSS and windows sizes before and after 
the performance drop.
How do I best capture them? tdpcump? It's GbE linkspeed...
Or is netstat capable to show these values? Or is there any way to read 
out the values stored in tcp.hostcache?

Thanks,

-Harry

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