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@@ -242,10 +242,14 @@ config SPARSE_IRQ
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bool "Support sparse irq numbering"
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depends on PCI_MSI || HT_IRQ
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help
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- This enables support for sparse irq, esp for msi/msi-x. You may need
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- if you have lots of cards supports msi-x installed.
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+ This enables support for sparse irqs. This is useful for distro
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+ kernels that want to define a high CONFIG_NR_CPUS value but still
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+ want to have low kernel memory footprint on smaller machines.
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- If you don't know what to do here, say Y.
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+ ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
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+ out the irq_desc[] array in a more NUMA-friendly way. )
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+
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+ If you don't know what to do here, say N.
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config NUMA_MIGRATE_IRQ_DESC
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bool "Move irq desc when changing irq smp_affinity"
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Ingo Molnar