Re: Spreading NIC interrupts across multiple CPUs
On 3/26/2014 1:28 PM, Aaron Seelye wrote:
> I have a question regarding interrupt balancing for a NIC across CPUs. I
> have a Dell R710 (dual quad core) with embedded broadcom 5709 that seems
> to put everything on the CPU0. I even threw an Intel Pro/1000 PT in the
> Dell, but this is showing the same problem.
>
> For a test system, I have an HP DL360-G5 (also dual quad core) with
> embedded broadcom 5708 that balances across all cores. I've also thrown
> in an identical Intel NIC, and it seems to balance across the cores
> properly. This leads me to believe that there's something wrong with my
> BIOS setup, or there's something inherently wrong with the R710, though
> I'm leading towards the former, as I'm seeing this on two R710s, and
> doubt I'd hit a magic breakage across two chassis.
>
> Also, this is with no massaging on my part, both running up to date
> debian wheezy 7.4, with the Dell being installed originally with 7.1
>
> My question is this, what option(s) could be present with the R710 bios
> that would cause something like this to happen? If not the bios,
> where/what else should I look at?
Please read this for educational background, especially the Note at the
bottom of the page.
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/s-cpu-irq.html
Then ask an intelligent question about IRQ balancing and steering, WRT
the two specific and different hardware systems, and Debian kernel
versions, being used on each.
Cheers,
Stan
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