Public bug reported:
Write IOPS and Latency performance issue observed after upgraded our
Ubuntu 22.04 Jammy kernel from 6.5.0-27 to 6.8.0.40
- vdbench tool used to measure the performance
- Read workloads have improved across threads(1 to 128) and block size(4K to
512K)
- It’s the write IO latency which has affected the most after kernel upgrade.
- Write response and IOPS drop is seen from Kernel 6.8.0.40
- Write response and IOPS dropped especially with rw_8k, rw_32k and wo_128k
workloads (please check the attachment for detailed numbers)
- We have compared the results with latest Jammy kernel 6.8.0-60-generic and
this also shows the write perf issue.
Ubuntu 22.04.5 LTS
Linux omnicube-ip15-201.hcilabs.hpecorp.net 6.8.0-60-generic
#63~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 22 19:00:15 UTC 2 x86_64
x86_64 x86_64 GNU/Linux
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "6.5_vs_6,8 vdbench perf results"
https://bugs.launchpad.net/bugs/2121018/+attachment/5900452/+files/6.5_vs_6.8
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https://bugs.launchpad.net/bugs/2121018
Title:
Write IO performance degrade after upgrading Ubuntu 22.04 Jammy kernel
from 6.5.0-27 to 6.8.0.40
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