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Date: Thu, 29 Jan 2009 14:05:57 -0800 From: SUJIT V <sujit.linux@...il.com> To: linux-kernel@...r.kernel.org Subject: Re: x86_64 IOAPIC Forgot to mention that we are not using the irqbalance utility. So which part of the kernel io_apic code is doing the irq balancing which we see in /proc/interrupt. Thanks On Thu, Jan 29, 2009 at 2:02 PM, SUJIT V <sujit.linux@...il.com> wrote: > Hi, > We have a IBM Qauadcore 8 CPU system running x86_64 linux 2.6.23. > We were doing some performance test. (disk & network). > The eth0 IRQ is pinned to CPU0. The aacraid interrupt has not been > assigned any smp affinity. > > On the system we see in (/proc/interrupts) that when the eth0 > interrupt rate is high, the aacraid interrupt counter for CPU0 does > not increase as much compared to aacraid interrupts handled by other > CPUs . > This shows that IOAPIC is doing some load balancing. > > I wanted to check the code which is doing this load balancing. I > checked the file arch/x86_64/kernel/io_apic.c. I could not find any > irq balancing stuff out there. > I went through some archived discussions about the x86_64 ioapic irq > balancing. Most of the discussions were about using irqbalance > utility. > > > Could some one point me to the relevant piece of io_apic code ? > > > Thanks > -- 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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