[LU-9227] Changing rate of a TBF rule loses control in some testcases

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.10.0
• Labels: patch
• Severity: 3
• Assignee: Qian Yingjin (Inactive)
• Reporter: Qian Yingjin (Inactive)

Description

In the following test cases, changing rate of a TBF rule lose control:

start dd_0 {dd.0} 1000
dd if=/dev/zero of=/mnt/lustre/test bs=1M count=100
start dd_1000 {dd.1000} 1000

After ran above commands, changing rate of dd_0 takes no effect.
The reason is:

starting rule dd_1000 increases the sequence, but the sequence number of the class with id "dd.0" does not change accordingly, resulting in failure of rate change.

Issue Links

• is related to: LU-9140 sanityn test_77j test_77k: The read / write rate exceeds x% of preset rate
• is related to: LU-3558 NRS TBF policy for QoS purposes