Hi, We have the same issue since we use RHEL 6.X/SL 6.X
Topic : HP Z400 system very slow at ramdom times for 5 minutes (october 2011) We use HP workstations (XW4600, Z200, Z400, ...), VM, DELL laptops and the problem is only present on Z400 (xeon) et an HP pavilion (corei7). The problem is not present if we use 2.6.32 kernel from kernel.org. We have a case on RHN ... Last RH comment was : We have analysed the results and see that there is nothing waiting on I/O but there is a high CPU usage and large run queue. Geoffroy Turtaut
