Bug 222921 - On Greyhound CPUs, the 2.4.21-40.EL #1 SMP kernel appears to drive the 100HZ timer interrupts with NMIs
On Greyhound CPUs, the 2.4.21-40.EL #1 SMP kernel appears to drive the 100HZ ...
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
x86_64 Linux
medium Severity medium
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Assigned To: Red Hat Kernel Manager
Brian Brock
Depends On:
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Reported: 2007-01-16 16:22 EST by Jim Mattson
Modified: 2007-11-16 20:14 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2007-10-19 14:39:10 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Jim Mattson 2007-01-16 16:22:17 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'
Actual results:

NMIs are delivered at 100HZ.

Expected results:

NMIs should occur only infrequently.

Additional info:
Comment 1 RHEL Product and Program Management 2007-10-19 14:39:10 EDT
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.

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