Hello @jan-launchpad-xud and @soeby. The patches we introduced to fix bug 2003053 unfortunately introduced a regression that was not caught by our tests and the reviews done internally and by upstream. The regression was fixed as soon as we could and we apologize for the inconvenience. We do have extensive quality control processes but unfortunately sometimes issues are discovered after a kernel is released.
The Ubuntu LTS kernels are not necessarily a 1-to-1 match with the upstream LTS releases, we do pick up every patch applied to the upstream stable kernels but we apply other patches to provide extra fixes for our users. The reason we backported a patchset from an upstream -rc release was not unknown or randomly, it was based on a real issue that was affecting our users. If you could kindly provide more information about the issues that you are currently having with the Ubuntu kernels that were caused by the changes to fix bug 2003053 and bug 2009325 we would be happy to investigate and provide a solution if possible. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2015827 Title: NFS performance issue while clearing the file access cache upon login Status in linux package in Ubuntu: In Progress Bug description: The performance issue that has been observed may be attributed to an increase in NFS ACCESS operations, possibly due to a new mechanism introduced in the Linux 6.2-rc3 NFS client side. This mechanism clears the access cache as soon as the cache timestamp becomes older than the user's login time, with the primary objective of preventing the NFS client's access cache from becoming stale due to any changes made to the user's group membership on the server after the user has already logged in on the client. It's worth noting that POSIX only refreshes the user's supplementary group information upon login. Upstream has taken into consideration that users may reasonably expect the access cache to be cleared when they log out and log back in again, with all behavior returning to normal after the replacement. The performance overhead can be particularly noticeable when applications or users switch to other privileged users via commands such as "su" to operate on NFS-mounted folders. In such cases, the privileged user's login time will be renewed, and NFS ACCESS operations will need to be re-sent, potentially leading to performance degradation. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2015827/+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
