Re: Add extra_buff_count flag

[Jens Axboe <jens.axboe@oracle.com>]

On Tue, Nov 03 2009, Radha Ramachandran wrote:
> Hi,
> I was trying to use the async_verify option. Looks like if we use this
> option for synchronous I/O, then it really doesnt do anything as after
> every I/O is completed, we still need the asynchronous verify thread
> to complete the verification and release the io_u so the main thread
> can allocate this io_u for the next I/O. So to remove this bottle neck
> I added a new option extra_buff_count. This takes an integer and the
> code will allocate that many more extra io_us. This way when the main
> thread has completed the I/O it will have extra io_u and buffers to
> issue more I/Os while the asynchronous verify threads do their job.
> This can be used with both synchronous and libaio contexts.

Does iodepth=x not work for that? If not, I suggest we fix that instead
of adding a new parameter for it.

-- 
Jens Axboe