[LU-12629] large CPU usage during obdecho-survey test

• Status: Resolved
• Project: Lustre
• Type: Bug
• Priority: Major
• Reporter: Alexey Lyashkov
• Assignee: WC Triage
• Resolution: Duplicate
• Severity: 3

Description

Large CPU usage found during obdecho-survey test. Based on profiling, page allocation is result of it. Looking in lustre logs, lu_env used to store paged don't reused and allocated for each call. as obdecho env already uses an CL tag, it good to reuse a cl env cache as similar as does for md operations.

Comments

[Alex Zhuravlev]

looks like a dup of LU-12578. I agree we should try to reuse cl_env_get() infrastructure.

[Gerrit Updater]

Alexey Lyashkov ([e-mail]) uploaded a new patch: https://review.whamcloud.com/35700
Subject: LU-12629 obdecho: reuse an cl env cache for obdecho survey
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 77a201012961541bbe51b59f1409fabccfc37044

[Alexey Lyashkov]

Alex, probably. LU-12578 is declined to submit. with attached patch CPU dropped by 90%, bw is increased by 10%-30% as CPU isn't bottleneck now.

[Alexey Lyashkov]

resubmit for LU-12578, this ticket can close.

[Peter Jones]

Alexey - for future reference you should have the ability to mark tickets as RESOLVED