R21xx-HP FlexFabric 11900 Network Management and Monitoring Configuration Guide

104
Configuring kernel thread deadloop detection
CAUTION:
Inappropriate configuration of kernel thread deadloop detection can cause service problems or system
breakdown. Make sure you understand the impact of this configuration on your network before you do it.
Kernel threads share resources. If a kernel thread monopolizes the CPU, other threads cannot run,
resulting in a deadloop.
This feature enables the device to detect deadloops. If a thread occupies the CPU for a specific interval,
the device considers that a deadloop has occurred. It generates a deadloop message and reboots to
remove the deadloop.
To configure kernel thread deadloop detection (in standalone mode):
Ste
p
Command Remarks
1. Enter system view. system-view N/A
2. Enable kernel thread
deadloop detection.
monitor kernel deadloop enable [ slot
slot-number ]
By default, the function is
enabled.
3. (Optional.) Set the interval
for identifying a kernel
thread deadloop.
monitor kernel deadloop time interval [ slot
slot-number ]
The default is 8 seconds.
4. (Optional.) Disable kernel
thread deadloop detection
for a kernel thread.
monitor kernel deadloop exclude-thread
tid [ slot slot-number ]
After enabled, kernel thread
deadloop detection monitors
all kernel threads by default.
To configure kernel thread deadloop detection (in IRF mode):
Ste
p
Command Remarks
1. Enter system view. system-view N/A
2. Enable kernel thread
deadloop detection.
monitor kernel deadloop enable [ chassis
chassis-number slot slot-number ]
By default, the function is
enabled.
3. (Optional.) Set the interval
for identifying a kernel
thread deadloop.
monitor kernel deadloop time interval
[ chassis chassis-number slot slot-number ]
The default is 8 seconds.
4. (Optional.) Disable kernel
thread deadloop detection
for a kernel thread.
monitor kernel deadloop exclude-thread
tid [ chassis chassis-number slot
slot-number ]
After enabled, kernel thread
deadloop detection monitors
all kernel threads by default.
Configuring kernel thread starvation detection
CAUTION:
Inappropriate configuration of kernel thread starvation detection can cause service problems or system
breakdown. Make sure you understand the impact of this configuration on your network before you do it.
Starvation occurs when a thread is unable to access shared resources.