[Pkg-xen-devel] Bug#577788: dom0 kernels should suggest irqbalance

[Ian Campbell]

(copying debian-kernel for reasons which will hopefully become obvious)

On Mon, 8 Jul 2013 18:10:58 +0200 =?UTF-8?Q?Moritz_M=C3=BChlenhoff?= <jmm at inutil.org> wrote:
> In current Debian kernel there's no special Xen dom0 kernel image and depending
> on irqbalance in the kernel package would be overkill.

Would it? I thought irqbalance is actually required even for native with
modern kernels, since the kernel doesn't do any balancing by itself (any
more, it did use to).

Looking on my laptop for instance I see that all interrupts are going to
CPU0 out of the 4 processes. On the other hand my workstation does seem
to have balanced IRQs despite having no irqbalanced running, so I don't
know.

I reckon the kernel probably should recommend irqbalance these days, but
in any case there is no reason for Xen to do something different (since
IRQ balancing should work as on native).

Ian.