> What immediately jumps out at you is that linear read/writes > perform just as nicely or actually better with MQ than with the > old block layer. > > What is amazing is that just a little randomness, such as the > find . > /dev/null immediately seems to visibly regress with MQ. > My best guess is that it is caused by the absence of the block > scheduler.
The block tree now has a basic deadline scheduler. So for now I'd suggest to kick off the discussion on all these prep patches, and then retest with 4.11-rc1 or 2 that will have the scheduler.
