After a lot of tests on AWS with generic and AWS kernels and on non-AWS bare-metal systems with the AWS and generic kernels I discovered that one gets I/O throttling on AWS instances regardless of using ZFS or not.
I ran a really simple test writing and reading to the raw device and found the *same* I/O throttling characteristics. This is due to a feature known as "EBS I/O throttling", see: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html and https://aws.amazon.com/ebs/features/ This is not a zfs issue per se, or a kernel issue, but due to I/O throttling with the cloud provider. Marking this as won't fix. ** Changed in: zfs-linux (Ubuntu) Status: Incomplete => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1883676 Title: ZFS performance drops suddenly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1883676/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
