** Attachment added: "vdbench" https://bugs.launchpad.net/ubuntu/+bug/2121018/+attachment/5900454/+files/Screenshot%202025-08-20%20at%2012.14.11%E2%80%AFPM.png
** Description changed: 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. + - 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. - + - We have compared the results with latest Jammy kernel 6.8.0-60-generic and also shows the same 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2121018/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
