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Updated 2012-09-16T02:04:13+00:00 -

When some CPUs on an Intel Xeon 5500 series-based system running Red Hat Enterprise Linux 5.3 are in the ACPI C3 C-state (sleep state) and others are not, users will see an issue where the CPU in charge of IRQ 0 suffers a performance penalty of 10% or more due to overhead.
For example, CPU 0 and CPU 8 on a test system take 11.05 seconds to run a test program and a...

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