RAC waitevent: gc freelist on one node

Hi,
We have having a 3 node RAC and from last few days noticed performance of 1 of 
node has degraded. In V$session session of that node, I always see lot of 
sessions waiting on waitevent "gc freelist". I don't see this wait event on 
other 2 nodes where performance is not affected.
Not sure if this wait event is indicating something. I could not find any 
documentation on this wait event Can somebody please explain me this wait event 
or point me to right document. Does this wait event looks related to degraded 
performance?
Pls advice.
--Ajay

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