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Date: Wed, 24 Mar 2010 18:11:36 -0700 From: James Lamanna <jlamanna@...il.com> To: linux-kernel@...r.kernel.org Subject: Hardware Interrupt Balancing Hi, I have a Dual Xeon (single core each w/HT) machine and I noticed the other day that interrupts are not being balanced across the 2 processors: CPU0 CPU1 CPU2 CPU3 0: 306 0 0 3254413993 IO-APIC-edge timer 1: 0 0 0 13468 IO-APIC-edge i8042 8: 0 0 0 3 IO-APIC-edge rtc 9: 0 0 0 0 IO-APIC-level acpi 12: 0 0 0 4 IO-APIC-edge i8042 169: 0 0 0 0 IO-APIC-level uhci_hcd:usb2 177: 0 0 0 16743166 IO-APIC-level ata_piix 185: 0 0 0 1 IO-APIC-level ehci_hcd:usb1 193: 0 0 0 0 IO-APIC-level uhci_hcd:usb3 201: 0 0 0 1867922172 IO-APIC-level eth0 209: 0 0 0 3254690559 IO-APIC-level wct4xxp NMI: 1 0 0 0 LOC: 3255261535 3255261540 3255261549 3255220504 ERR: 0 MIS: 0 However the cpu_affinity of say, wct4xxp is: # cat /proc/irq/209/smp_affinity 0000000f Is there something (CPU Hotplug?) preventing the hardware interrupts from being balanced across both CPUs? The kernel version is 2.6.18 (i686) (this is an older machine that is a PSTN<->SIP gateway). Thanks. -- James Please CC me for I am not subscribed. -- 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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