HPE FlexNetwork 10500 SERIES Troubleshooting Manual page 34

− Verify that STP is enabled and correctly configured.
− Verify that STP is operating correctly on neighboring devices.
c. If the problem persists, an STP protocol calculation error might have occurred or interfaces
are not blocked at the driver level as expected. Shut down the uplink interface of the loop or
disconnect the cable and then connect the cable again to trigger STP recalculation to
recover services. Send the symptom information to Hewlett Packard Enterprise Support for
analysis.
4. If the problem persists, execute the display cpu-usage command multiple times to locate the
card that has a high CPU resource usage.
5. If you still cannot locate the problem, identify the job that has a high CPU usage. For example:
[Sysname-probe] display process cpu slot 1
CPU utilization in 5 secs: 2.4%; 1 min: 2.5%; 5 mins: 2.4%
JID 5Sec
1 0.0%
2 0.0%
3 0.0%
4 0.0%
5 0.0%
6 0.0%
7 0.0%
8 0.0%
9 0.0%
10 0.0%
11 0.0%
......
The output shows the average CPU usage values of jobs for the last 5 seconds, 1 minute, and
5 minutes. Typically, the average CPU usage of a job is less than 5%
6. Display the job's stack. Perform this step for a minimum of five times. In this example, the job
uses the ID of 145.
[Sysname-probe] follow job 145 slot 1
Attaching to process 145 ([dGDB])
Iteration 1 of 5
------------------------------
Kernel stack:
[<ffffffff80355290>] schedule+0x570/0xde0
[<ffffffff80355da8>] schedule_timeout+0x98/0xe0
[<ffffffff802047e4>] ep_poll+0x4b4/0x5e0
[<ffffffffc05587a8>] DRV_Sal_EVENT_Read+0x1f8/0x290 [system]
[<ffffffffc07351e4>] drv_sysm_gdb_console+0xc4/0x2d0 [system]
[<ffffffffc1a04114>] thread_boot+0x84/0xa0 [system]
[<ffffffff8015c420>] kthread+0x130/0x140
[<ffffffff801183d0>] kernel_thread_helper+0x10/0x20
Iteration 2 of 5
------------------------------
Kernel stack:
[<ffffffff80355290>] schedule+0x570/0xde0
[<ffffffff80355da8>] schedule_timeout+0x98/0xe0
[<ffffffff802047e4>] ep_poll+0x4b4/0x5e0
1Min 5Min Name
0.0% 0.0% scmd
0.0% 0.0% [kthreadd]
0.0% 0.0% [migration/0]
0.0% 0.0% [ksoftirqd/0]
0.0% 0.0% [watchdog/0]
0.0% 0.0% [migration/1]
0.0% 0.0% [ksoftirqd/1]
0.0% 0.0% [watchdog/1]
0.0% 0.0% [migration/2]
0.0% 0.0% [ksoftirqd/2]
0.0% 0.0% [watchdog/2]
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