On Thu, Dec 13, 2012 at 05:47:14PM +0100, Bart Van Assche wrote: > From my experience with block and SCSI drivers option (1) doesn't > look attractive from a performance point of view. From what I have > seen performance with QD=1 is several times lower than performance > with QD > 1. But maybe I overlooked something ? What you might be missing is that at least on Linux no one who cares about performance uses the Posix AIO inferface anyway, as the implementation in glibc always has been horrible. The Linux-native aio interface or the various thread pool implementations don't imply useless ordering and thus can be used to fill up large queues. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
