On Tue, Jun 28, 2022 at 03:42:52PM +0800, Ming Lei wrote: > I don't see there is 'queue depth' for bio or bio driver. > > 32 bytes have been big, and memory footprint is increased too since the data has been > prepared for the future possible rewind. If crypt or integrity is considered, it > can be bigger. Put some thought into this, Ming. I think you've absorbed some "received wisdom", some of the implicit assumptions everyone seems to be making without ever doing any math to check if they make sense. There may not be a "queue depth" for all drivers, but the same latency considerations apply - if you have an unbounded number of IOs in flight, you're going to be having other, much more significant issues.
