[LU-13288] a performance regression on the single stream write

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Environment: master(commit:2c0b2b7), CentOS8.1
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shuichi Ihara

Description

The latest master(commit:2c0b2b7) has a performance regression on the single stream write below.

test node: Xeon(R) Gold 5218 CPU @ 2.30GHz, 96GB memory, 1 x HDR-100
lustre params: osc.*.max_pages_per_rpc=16M osc.*.max_rpcs_in_flight=16 osc.*.max_dirty_mb=512 llite.*.max_read_ahead_mb=2048 osc.*.checksums=0

# ior -w -t 1m -b 192g -e -o /scratch/testdir/file
master(commit:2c0b2b7)
Max Write: 799.98 MiB/sec (838.84 MB/sec)

2.13.0
Max Write: 2268.02 MiB/sec (2378.19 MB/sec)

Issue Links

• is related to: LU-13289 cgroup writeback support for Lustre kernel 5.2+ is broken