I've found MySQL fairly slow on EC2 and I am sure it is disk speed. My EC2 install is a test environment so I don't need to keep the data if a block should fail which I think allows me to use XFS.
So....What is the fastest filesystem to use under Linux on EC2 for MySQL?
EDIT: I am using EBS, also I am looking to see if anyone has experience outside of EXT3 as that is what I already find slow