Judging from the utter lack of response to the core issue of backporting untested patches from an - at the time - release candidate unstable upstream Linux version, back to what is supposed to be *three* long term support "enterprise grade" Ubuntu editions, it seems that Ubuntu's policy for Linux kernels has gone to "move fast and break things".
Basically, for stability with Ubuntu, there is now only one option: Roll your own Linux LTS kernels. This experience has completely undermined my trust in Ubuntu as a stable platform for servers. -- 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
