[LU-18576] updating llog's timestamp on every new record introduces a performance penalty

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

upto 15% in the microbenchmark:

[   12.236741] Lustre: took 76627 waiting, 2394 / rec in 1 threads
[   13.341116] Lustre: took 60811 waiting, 1900 / rec in 4 threads

without timestamp:

[   12.218171] Lustre: took 68078 waiting, 2127 / rec in 1 threads
[   13.323605] Lustre: took 53228 waiting, 1663 / rec in 4 threads