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| author |   Ingo Molnar <mingo@elte.hu> | 2008-12-25 16:26:47 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-25 16:26:47 +0100 |
| commit | 973656fe1afb4adf95d7b9ab75d4660cd3821ea1 (patch) | |
| tree | 5b617a8e9f87d1c89e0b5c8e3e01b2ea074f74c9 /arch | |
| parent | x86: turn CONFIG_SPARSE_IRQ off by default (diff) | |
| download | linux-dev-973656fe1afb4adf95d7b9ab75d4660cd3821ea1.tar.xz linux-dev-973656fe1afb4adf95d7b9ab75d4660cd3821ea1.zip | |
x86, sparseirq: clean up Kconfig entry
Impact: improve help text
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d14a8806227d..e4c038abb71c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -242,10 +242,14 @@ config SPARSE_IRQ bool "Support sparse irq numbering" depends on PCI_MSI || HT_IRQ help - This enables support for sparse irq, esp for msi/msi-x. You may need - if you have lots of cards supports msi-x installed. + This enables support for sparse irqs. This is useful for distro + kernels that want to define a high CONFIG_NR_CPUS value but still + want to have low kernel memory footprint on smaller machines. - If you don't know what to do here, say Y. + ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread + out the irq_desc[] array in a more NUMA-friendly way. ) + + If you don't know what to do here, say N. config NUMA_MIGRATE_IRQ_DESC bool "Move irq desc when changing irq smp_affinity" |