Can you collect the following: Backing device baseline (it's possible the underlying disks regressed instead of the bcache layer). the same fio randrw test against the underlying backing device with bcache disabled
And with bcache enabled on both setups before and after tuning: 1) grep -r . /sys/class/block/bcache*/bcache/ > bdev_stats 2) grep -r . /sys/fs/bcache/*-*-*-*-*/ > cdev_stats 3) grep -r . /sys/class/block/sd?/queue/scheduler > bdev_schedulers -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1806015 Title: bcache: performance regression without tuning under bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806015/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
