[LU-1413] difference of single client's performance between b2_1 and 2.1.2RC0

• Type: Bug
• Resolution: Duplicate
• Priority: Blocker
• Affects Version/s: Lustre 2.1.2
• Environment: CentOS6.2, the latest b2_1 branch and 2.1.2RC0
• Severity: 3
• Assignee: Oleg Drokin
• Reporter: Shuichi Ihara (Inactive)

Description

Performance differences between b2_1 and 2.1.2RC0

During single client performance testing (LU-1408), I saw another single client performance regression on b2_1 (checked out the latest on 05/15/12 http://git.whamcloud.com/?p=fs/lustre-release.git;a=commit;h=e9daba96e0a6bbe898b3d6207b2fe4bdd3293181) from 2.1.2RC0 tag.

Any changes after 2.1.2RC0 to potentially cause this regression?

Both version of lustre on the client are tested on the same hardware, same OS (CentOS, include kernel), same network and all.
The servers are running lustre-2.2.

I also tested on the client with FDR Infiniband as well as QDR Infiniband without lustre checksum.

Issue Links

• is related to: LU-969 2.1 client stack overruns
• is related to: LU-1408 single client's performance regression test
• is related to: LU-744 Single client's performance degradation on 2.1