Hello Mauricio, That was also one of the conclusion we reached yesterday.
I followed a wrong lead yesterday, after getting another more detailed output with klockstat. I'll update the description of the bug at the end, adding the bits I found. The system is not really having memory pressure but to confirm this, we resized the memory allocated to a VM on the server from 64GB to 44GB and looked into the shrinker behavior. It didn't change a thing, and the IO wait started to rise again. As for the IO load, I'm not sure, I would probably need to do a blktrace and register it (never did that, but I read that you can then passes the result to fio to reproduce a load) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1898786 Title: Issue with bcache bch_mca_scan causing huge IO wait To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1898786/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
