Anand, The issue may be related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107347 Can you please check if the degradation persists if the workaround form the bug is applied?
Set kernel boot parameter "intel_iommu=off" and test this way. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-6.8 in 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 Status in linux-hwe-6.8 package in Ubuntu: New Bug description: 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 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.8/+bug/2121018/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
