Mutex wait

Hello All, IDS 11.50.FC8W2 on HP-Unix We experinced some dip in our performance(load jobs) and while checking the user I saw quite many sessions with S- flag indicating these were waiting on mutex. I checked in onstat -g ath and found the following different waits: 8815514 c000000a2ee36030 c000000a8fa7db48 1 mutex wait pt_940000a 12cpu sqlexec 9376796 c000000a54e18c10 c000000a865a1550 1 mutex wait nsf.lock 11cpu* sqlexec 9331804 c000000a2e8c1720 c000000a7ddc4888 1 mutex wait hash 0 175 10cpu sqlexec 8660524 c000000a3511a030 c000000a7ddf58d8 1 mutex wait <unknown> 9cpu sqlexec 8897413 c000000a511d3ae0 c000000a3777d370 1 mutex wait netnorm 1cpu sqlexec 8660524 c000000a3511a030 c000000a7ddf58d8 1 mutex wait hash 0 286 5cpu sqlexec Not all of these are waiting for nsf.lock! and I dont know what the others mean(hash 0 175, pt_940000a) ? Drilling down from ath - users - ses I saw the SQLs waiting for mutex, however these are normal SQLs running almost all the time while loading jobs run. What more do I check to link the performance dip with the mutex waits? Regards, Vikas