Messages in this thread Patch in this message | | | Date | Mon, 7 Apr 2003 02:04:05 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | [PATCH][2.5] Disable irqbalance for single cpu SMP configurations |
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This patch disables irqbalance and doesn't spawn a kernel thread for systems which run SMP kernels and only have one online cpu.
Index: linux-2.5.66/arch/i386/kernel/io_apic.c =================================================================== RCS file: /build/cvsroot/linux-2.5.66/arch/i386/kernel/io_apic.c,v retrieving revision 1.1.1.1 diff -u -p -B -r1.1.1.1 io_apic.c --- linux-2.5.66/arch/i386/kernel/io_apic.c 24 Mar 2003 23:40:27 -0000 1.1.1.1 +++ linux-2.5.66/arch/i386/kernel/io_apic.c 7 Apr 2003 05:19:26 -0000 @@ -603,6 +603,12 @@ static int __init balanced_irq_init(void c = &boot_cpu_data; if (irqbalance_disabled) return 0; + + /* disable irqbalance completely if there is only one processor online */ + if (num_online_cpus() < 2) { + irqbalance_disabled = 1; + return 0; + } /* * Enable physical balance only if more than 1 physical processor * is present -- function.linuxpower.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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