[PVE-User] High load on cpu0 with 3.10 pve kernel on proxmox 3.4

Thomas Lamprecht t.lamprecht at proxmox.com
Thu Aug 27 10:01:27 CEST 2015

On 08/24/2015 07:44 PM, Falko Trojahn wrote:
> Hi all,
> after upgrading our 3 nodes proxmox 3.4 system (using wheezy) from stock
> 3.2.0-4-amd64 debian kernel to 3.10.0-11-pve, we have only on one node
> and only on it's cpu0 approx. 93..100% load constantly with ksoftirqd.

ksoftirq should normally use more than a tiny percent of the cpu, your 
system is under high interrupt load which causes this behavior.

Often it's related to a situation when a high speed network card 
receives a very large number of packets in a short time frame.
Driver of your network card misconfigured/messed up?
What does:
> cat /proc/interrupts

> As our 3 systems are basically the same (mainboard is Supermicro
> X8DT3-F, running Intel 82598EB and 82599EB dual network controllers),
> I'd like to get suggestions how to track down why this is only on
> one system and perhaps what we can do to prevent this.
> Thank you very much
> and best regards
> Falko
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