Red Hat Bugzilla – Bug 222921
On Greyhound CPUs, the 2.4.21-40.EL #1 SMP kernel appears to drive the 100HZ timer interrupts with NMIs
Last modified: 2007-11-16 20:14:46 EST
Description of problem:
On AMD Greyhound (aka K8L) CPUs, timer interrupts are driven with NMIs,
resulting in degraded performance.
Version-Release number of selected component (if applicable): 2.4.21-40.EL #1 SMP
How reproducible: 100%
Steps to Reproduce:
1. Boot RHEL3 Update 7 on a Greyhound CPU, using the stock SMP kernel
2. Observe total NMI interrupts with 'cat /proc/cpuinfo'
NMIs are delivered at 100HZ.
NMIs should occur only infrequently.
This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
For more information of the RHEL errata support policy, please visit:
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.