[LU-744] Single client's performance degradation on 2.1

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Affects Version/s: Lustre 2.2.0, Lustre 2.3.0
• Severity: 3
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Shuichi Ihara (Inactive)

Description

During the performance testing on lustre-2.1, I saw the single client's performance degradation on it.
Here is IOR results on the single cleints with 2.1 and also lustre-1.8.6.80 for comparing.
I ran IOR (IOR -t 1m -b 32g -w -r -vv -F -o /lustre/ior.out/file) on the single client with 1, 2, 4 and 8 processes.

Write(MiB/sec)
v1.8.6.80 v2.1
446.25 411.43
808.53 761.30
1484.18 1151.41
1967.42 1172.06

Read(MiB/sec)
v1.8.6.80 v2.1
823.90 595.71
1449.49 1071.76
2502.49 1517.79
3133.43 1746.30

Tested on same infrastracture(hardware and network). The client just turned off the checksum on both testing.

Issue Links

• is related to: LU-1408 single client's performance regression test
• is related to: LU-1413 difference of single client's performance between b2_1 and 2.1.2RC0
• is related to: LU-3321 2.x single thread/process throughput degraded from 1.8
• is related to: LU-141 port lustre client page cache shrinker back to clio
• is related to: LU-1201 Lustre crypto hash cleanup