Re: 100% CPU load when generating traffic to destination network that nexthop is not reachable

On Tue, 2017-08-15 at 18:30 +0200, Paweł Staszewski wrote:

Hi


Doing some tests i discovered that when traffic is send by pktgen to 
forwarding host where nexthop for destination network on forwarding 
router is not reachable i have 100% cpu on all cores and perf top show 
mostly:

     77.19%  [kernel]            [k] queued_spin_lock_slowpath
     10.20%  [kernel]            [k] acpi_processor_ffh_cstate_enter
      1.41%  [kernel]            [k] queued_write_lock_slowpath

To the rescue (for us to help)

perf record -a -g sleep 10

perf report --stdio