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Date: Wed, 13 May 2009 14:25:28 +0100 From: Alexander Clouter <alex@...riz.org.uk> To: linux-kernel@...r.kernel.org Subject: Re: timer interrupt handled by CPU0 only qmh524 <qmh524@...il.com> wrote: > > I have start irqbalance service. Why the timer interrupt only happend in CPU0 > irqBALANCE...you could also ask why all your eth0 IRQ's are on CPU3 or your ATA action is on CPU2. It's my understanding you *steer* IRQ's to a CPU, you do not round-robin them across all the CPU's. Cheers > $ sudo service irqbalance status > irqbalance (pid 2390) is running... > $ cat /proc/interrupts > CPU0 CPU1 CPU2 CPU3 > 0: 21487296 0 0 0 IO-APIC-edge timer > 1: 3 0 0 0 IO-APIC-edge i8042 > 8: 1 0 0 0 IO-APIC-edge rtc > 9: 0 0 0 0 IO-APIC-level acpi > 12: 4 0 0 0 IO-APIC-edge i8042 > 74: 18 0 0 0 IO-APIC-level > uhci_hcd:usb1, uhci_hcd:usb3, ehci_hcd:usb4 > 82: 0 0 0 0 IO-APIC-level uhci_hcd:usb2 > 90: 1934 0 45886283 0 IO-APIC-level libata > 98: 0 0 0 0 IO-APIC-level libata > 106: 120 0 0 22824923 PCI-MSI eth0 > 169: 16933 0 9370507 0 IO-APIC-level ioc0 > NMI: 43241 26776 33934 29946 > LOC: 21487192 21487118 21487046 21486887 > ERR: 0 > MIS: 0 -- Alexander Clouter .sigmonster says: A hammer sometimes misses its mark - a bouquet never. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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