HIGH CPU irq usage



  • We have a problem with which we no longer advise. Without any cause, the CPU will be charged by interrupting the WAN interface. The logs are clear. There is no DDoS. Traffic drops from 1.5Gbps to 500Mbps. Do not you know where there might be a problem or how to find out what specifically causes the interruption?

    12 root    -92    -    0K  592K CPU3    3  36.5H  48.29% [intr{irq267: ix0:q3}]
      12 root    -92    -    0K  592K WAIT    0  36.6H  47.46% [intr{irq264: ix0:q0}]
      12 root    -92    -    0K  592K CPU1    1  36.0H  45.36% [intr{irq265: ix0:q1}]
        0 root    -92    -    0K  448K -      3  52:22  44.58% [kernel{ix0:q1}]
        0 root    -92    -    0K  448K RUN    2  52:48  44.38% [kernel{ix0:q0}]
        0 root    -92    -    0K  448K CPU2    2  52:33  43.65% [kernel{ix0:q2}]
      12 root    -92    -    0K  592K WAIT    2  36.6H  43.55% [intr{irq266: ix0:q2}]
        0 root    -92    -    0K  448K -      2  52:58  41.80% [kernel{ix0:q3}]

    Additional information:
    Is it possible that IPalias might be causing the problem? When trying to figure out the problem we only saved Firewall / Virtual IPs and ip aliases became completely unavailable. The subnets were not available.
    We have about 200 proxy ARP ip addresses on WAN and 2 IP aliases on LAN that we had to cancel. It did not help to restart the router.