performance issue with REL 4 hugemem kernel

Informix: IDS 10.00.UC7 Operating Systems: Red Hat Enterprise Linux Release 4 Update 6 (standard) Red Hat Enterprise Linux Release 4 Update 6 (hugemem) I'm running a pretty basic query in java using the JDBC driver. The query is: select a.column1, b.column2, from a, b where a.column3 = a.column4 and upper(?) matches a.column2 and upper(?) matches a.column4 The query on the standard kernel completes in < 1 second. The hugemem kernel takes > 12 seconds. This is the same IDS install, I'm just switching which kernel is loaded on boot. The explain output is identical in both instances. Has anyone else run across this or have any thoughts as to why this may be occurring and how to correct it? Thanks.