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I have recently tracked down a number of networking issues caused by cgroups introducing network stalls in certain scenarios. There were a number of patches submitted to upstream in v6.x to fix these issues. It is a constant pain seeing such fundamental networking issues still occurring in the latest linux kernel versions. On one hand I would like to track bleeding edge kernel releases to get the latest fixes and performance improvements, but on the other hand I do not have enough resources to maintain our own kernel builds and patches.



Do you have any references to specific bugs here? We depend pretty heavily on containers and I'd love to look into these and see if we are impacted and whether we should carry these patches


Landed in v6.2: https://lore.kernel.org/lkml/20221105005902.407297-3-longman...

Set to land in v6.4: https://lore.kernel.org/linux-mm/20230330191801.1967435-1-yo...

To see if you are affected run ‘sudo perf top’ and see if ‘blkcg_rstat_flush()’ shows up.

blkcg_rstat_flush is quite slow on some kernels and it disables IRQs on the cpu which blocks nic queues on the same CPU.




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