Quidway S6324-EI High loading of CPU

Created: Oct 10, 2018 13:59:54Latest reply: Dec 22, 2018 17:49:12 517 7 1 0
  Rewarded Hi-coins: 0 (problem resolved)
Colleagues, tell me please that for process VIDL , which utilizes ~ 50% of CPU :

display cpu-usage
CPU Usage Stat. Cycle: 60 (Second)
CPU Usage            : 52% Max: 94%
CPU Usage Stat. Time : 2018-10-10  08:57:43
CPU utilization for five seconds: 52%: one minute: 52%: five minutes: 52%
Max CPU Usage Stat. Time : 2018-02-27 16:51.

TaskName             CPU  Runtime(CPU Tick High/Tick Low)  Task Explanation
BOX                   0%         0/  f9fa1c       BOX Output                  
_TIL                  0%         0/       0       Infinite loop event task    
_EXC                  0%         0/       0       Exception Agent Task        
bcmRX                 3%         0/1ed3ea07       bcmRX                       
VIDL                 48%         1/57529ffe       DOPRA IDLE             
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Featured Answers
Created Oct 10, 2018 14:54:16 Helpful(0) Helpful(0)

Hello Sir

VIDL means : Idle task. A larger value for this task indicates a lower CPU usage.

VIDL = 48% means that CPU usage is relatively high
Please check all other tasks and check which task consumes more CPU

Please check all tasks list in below link:
http://support.huawei.com/hedex/pages/EDOC1000177841AEG11278/05/EDOC1000177841AEG11278/05/resources/dc/display_cpu-usage.html?ft=0&fe=10&hib=14.1.4.1.3&id=display_cpu-usage&text=display%20cpu-usage&docid=EDOC1000177841

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All Answers
m80047048 Created Oct 10, 2018 14:54:16 Helpful(0) Helpful(0)

Hello Sir

VIDL means : Idle task. A larger value for this task indicates a lower CPU usage.

VIDL = 48% means that CPU usage is relatively high
Please check all other tasks and check which task consumes more CPU

Please check all tasks list in below link:
http://support.huawei.com/hedex/pages/EDOC1000177841AEG11278/05/EDOC1000177841AEG11278/05/resources/dc/display_cpu-usage.html?ft=0&fe=10&hib=14.1.4.1.3&id=display_cpu-usage&text=display%20cpu-usage&docid=EDOC1000177841

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WheatGrass Created Oct 10, 2018 15:16:33 Helpful(0) Helpful(0)

In some network applications, a high CPU usage is a normal situation. Generally, a large network requires more CPU resources to process network traffic. When more member switches need to be managed in a stack, more CPU resources are required to maintain and manage the stack.

The device status is considered as normal in the following situations:
  • CPU usage does not exceed 80% when a device runs for a long period.
  • CPU usage does not exceed 95% when the device runs for a short period.

The following is list of scenarios where CPU usage commonly becomes high, but should not be considered a fault.

  • Spanning tree

    In MSTP, CPU usage is directly proportional to the number of instances and active ports. In VBST, each VLAN runs an independent instance. Therefore, VBST uses more CPU resources than MSTP when VBST and MSTP have the same number of VLANs and ports.

  • Routing table update

    When a Layer 3 switch receives a route update message, the switch uses CPU resources to update routing information to the forwarding plane. In a stack, the switch also needs to synchronize routing information to other member switches. During a routing table update, the following factors affect CPU usage:
    • Number of routing entries
    • Update frequency
    • Number of routing protocol processes that receive the update message
    • Number of member switches in a stack
  • Command execution

    CPU usage temporarily becomes high when commands that have a long execution time are used, for example:
    • The copy flash:/ command is executed in the user view.
    • Some debugging commands have a large amount of display information, especially when debugging information is displayed through the serial port.
  • Other scenarios

    • A port fast learns MAC addresses after having the sticky MAC function enabled.
    • A large number of ports are added to a large number of VLANs. For example, port groups are used to add a large number of ports to a large number of VLANs and change the link type of these ports.
    • Frequent or a large number of IGMP requests
    • Frequent network management operations
    • A large number of concurrent DHCP requests (For example, when a switch functions as a DHCP server, it restores connections with a large number of users.)
    • ARP broadcast storm
    • Ethernet broadcast storm
    • A large number of concurrent protocol packets are forwarded through software. For example, L2PT transparently transmits a large number of BPDUs within a short time or DHCP relay/snooping-enabled switch forwards DHCP packets through software.
    • A large number of data packets that cannot be forwarded through hardware are sent to the CPU, such as ARP Miss packets.
    • A port frequently alternates between Up and Down states.
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vsh Created Oct 10, 2018 15:54:59 Helpful(0) Helpful(0)

Posted by m80047048 at 2018-10-10 14:54 Hello SirVIDL means : Idle task. A larger value for this task indicates a lower CPU usage.VIDL = 48% ...
Thanks .

display cpu-defend configuration packet-type snmp

Packet Name Status Cir(Kbps) Cbs(Byte) Queue Port-Type
----------------------------------------------------------------------
snmp Enabled 128 16000 3 NNI
----------------------------------------------------------------------

Colleagues prompt how to remove rate limit SNMP to replace Enable with Disable?
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faysalji Created Oct 11, 2018 14:09:15 Helpful(0) Helpful(0)

Good details.
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faysalji Created Oct 25, 2018 14:16:52 Helpful(0) Helpful(0)

Posted by m80047048 at 2018-10-10 11:54 Hello SirVIDL means : Idle task. A larger value for this task indicates a lower CPU usage.VIDL = 48% ...
Thank YOu
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faysalji Created Oct 25, 2018 14:17:11 Helpful(0) Helpful(0)

Posted by WheatGrass at 2018-10-10 12:16 In some network applications, a high CPU usage is a normal situation. Generally, a large network req ...
Thanks:)
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If you think my post/reply is useful, please click the Helpful button and flag my post as a BEST ANSWER. Thanks
4am Created Dec 22, 2018 17:49:12 Helpful(0) Helpful(0)

When it is high, you can view the latest logs
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