[sheepdog] [PATCH v5 0/5] add support to non-aglined read/write/create

[Liu Yuan]

On 05/23/2013 04:01 PM, Joseph Glanville wrote:
> Yep, I have been reading that code.
> 
> I think libaio would be more efficient when using faster backing
> devices but it's probably not a problem due to how MD is structured.
> If you have one vnode/md for each physical disk it should result in
> good IO performance.
> 
> I intend on testing sheepdog with some big 36 drive machines soon to
> prove that theory though, try get  feel for how well MD scales.

Switch to aio isn't impossible and nonsense. Actually, I think aio model
can work with current threading model similar to Linux's io scheduler
that have one or several queues to run the requests and have io-threads
to submit the io-requests to the queue(s). This might reduce the threads
scheduling overhead and provide a more insight view of how requests can
be executed more efficiently and provide the possibility to optimized
the io scheduling on our own.

Thanks,
Yuan