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Old 09-10-2007, 02:22 PM   #1
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Registered: Apr 2007
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no load balancing for MSI-PCI interrupt controller on SMP linux

I was just parousing /proc/interrupts, and noticed that eth0 is only receiving interrupts on cpu0 of my dual-processor machine. All other devices are load balancing their interrupts properly across the two cpus. Further investigation reveals it using MSI-PCI as an interrupt controller instead of IO-APIC-*. I assume that load balancing is not working or is not supported for MSI-PCI ?

There have been a few posts on the internet about support for processor affinity bitmasks - but it is obviously preferable to have load balancing, in general. More specifically, the best I could hope for is to tax cpu1 instead of cpu0. Which is basically the same thing.

I happen to be talking about a workstation, here - not a high transaction network server, so all of this is moot, in way - but I am still curious to learn!


Last edited by jhwilliams; 09-10-2007 at 02:36 PM.


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