IoUring: Explicit set CQSIZE by default and use a much saner default … - #15477

…value for the submission ring

Motivation:

As default we used a size of 4096 for the submission ring which these days does not make a lot of sense anymore as you can size the submission queue and completion queue seperately.
Generally speaking usually you see much more completions compared to submissions, especially as we enable multishot by default these days. Beside this you should also not batch too
much in general before submission as this will affect latency. Because of this we should use a more sane default value for the submission queue which will also ensure we submit fast enough
while still get some batching to reduce syscalls. Also we need to size the completion queue big enough to be able to receive enough completioms per batch.

Modifications:

- Change the default submission queue size to 128
- Change the default completion queue size to 4096

Result:

Better defaults