-XXdisablefatspin in 1.4.2_04...what does this mean ?

I am not able to find any doc on this vm option. We are having a issue with this VM ( without the disablefatspin option set ) running weblogic, where after a few hundred requests ( on a SMP machine ), the VM does not respond. We are forced to restart. Thread dumps show a "lock chain" although no deadlocks.
Somebody in this newsgroup ( archive ) had suggested setting the "-XXdisablefatspin option. What does this option do ? Any docs related to this for 1.4.2_04 VM ?
Thanks
-- pady

Take a look at the following post on the subject:
http://forums.bea.com/bea/message.jspa?messageID=202464561&tstart=0
Regards,
/Staffan

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