Poor Performance When Running Splunk Enterprise on RHEL with Transparent Huge Pages Enabled

Issue

• Splunk Enterprise system (indexer) performance degraded significantly after upgrading from RHEL 5 to RHEL 6.
• Splunk Enterprise very high load. Iostat seems to indicate system is waiting on I/O with low disk utilization and low over all utilization.
• Splunk process (search engine) starts, load average spikes significantly, and %sys increases. Don't seem to be sending/waiting on IO.