This issue is fixed in the mainline kernel, 6.5.10 and higher. Re Possible bug report kernel 6.5.06.5.1 high load when CIFS share is mounted (cifsd-cfid-laundromat inD state) https://lore.kernel.org/lkml/cao+kfxqgxosx6u+xlkgje0kdifsragstspnrwxjqf6udgz5...@mail.gmail.com/T/
The relevant patches: "smb3: allow controlling length of time directory entries are cached with dir leases" https://github.com/torvalds/linux/commit/238b351d0935 "smb3: allow controlling maximum number of cached directories" https://github.com/torvalds/linux/commit/6a50d71d0fff "smb3: do not start laundromat thread when dir leases disabled" https://github.com/torvalds/linux/commit/2da338ff752a "smb: client: make laundromat a delayed worker" https://github.com/torvalds/linux/commit/e95f3f744650 "smb: client: prevent new fids from being removed by laundromat" https://github.com/torvalds/linux/commit/81ba10959970 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-hwe-6.5 in Ubuntu. https://bugs.launchpad.net/bugs/2049242 Title: CIFS Mounts Keep Load Average at n+1 Status in linux-signed-hwe-6.5 package in Ubuntu: Confirmed Bug description: Today I noticed that my two primary Ubuntu boxes were running at high load. After investigation, I discovered at that unmounting their CIFS shares alleviating the high load. I rebooted to the previous kernel, linux-modules-6.2.0-39-generic, and saw that the load was low after everything had settled after startup. I rebooted to the current kernel, linux-modules-6.5.0-14-generic, and again saw the high load. The load appears to be n+1, where n is the number of CIFS mounts. (Based on a sample of two boxes.) I confirmed that the default mount options (e.g. the ones not specified in fstab) are the same between the two kernels. This *might* also be slowing down external (USB disk access. I'm still investigating that. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.5.0-14-generic 6.5.0-14.14~22.04.1 ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3 Uname: Linux 6.5.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Fri Jan 12 19:47:25 2024 InstallationDate: Installed on 2020-10-01 (1198 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed-hwe-6.5 UpgradeStatus: Upgraded to jammy on 2023-01-01 (376 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.5/+bug/2049242/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
