Bug#681767: linux-image-3.2.0-3-rt-amd64: irq/23-eth0 high load
On Mon, 20 Aug 2012 04:46:53 +0100
Ben Hutchings <ben@decadent.org.uk> wrote:
> On Mon, 2012-07-16 at 10:48 +0000, Yevgeny Kosarhevsky wrote:
> > Package: src
> > Version: 3.2.21-3
> > Severity: critical
> > Justification: causes serious data loss
>
> What data?
My peers reported packet loss. Switching back to 2.6.32 kernel solved the issue.
> > Dear Maintainer,
> > I get a heavy load on irq/23-eth0:
> > 1086 root -51 0 0 0 0 S 2.0 0.0 0:31.04 irq/23-eth0
>
> I don't think 2% CPU time is a 'heavy load'.
>
> > This is only occured after upgrading from 2.6.32 kernel.
> > The LA was 0.00 on previous kernel, now it's 1.44
> [...]
>
> But you are not comparing like with like. On a real-time kernel, IRQ
> handlers are scheduled as tasks and are accounted in the load average.
> On a standard kernel as you were running before, IRQ handlers are
> accounted separately.
>
> So, is there really a problem here? Did you actually mean to install a
> real-time kernel?
Since there was a packet loss, I think there is a problem. I don't know if it's related with
> [ 1966.544292] NOHZ: local_softirq_pending 08
> [ 2108.848600] NOHZ: local_softirq_pending 08
--
Yevgeny Kosarzhevsky <phaoost@gmail.com>
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