"Michael S. Tsirkin" <[email protected]> writes: > On Thu, Jul 19, 2012 at 08:05:42AM -0500, Anthony Liguori wrote: >> Of course, the million dollar question is why would using AIO in the >> kernel be faster than using AIO in userspace? > > Actually for me a more important question is how does it compare > with virtio-blk dataplane?
I'm not even asking for a benchmark comparision. It's the same API being called from a kernel thread vs. a userspace thread. Why would there be a 60% performance difference between the two? That doesn't make any sense. There's got to be a better justification for putting this in the kernel than just that we can. I completely understand why Christoph's suggestion of submitting BIOs directly would be faster. There's no way to do that in userspace. Regards, Anthony Liguori > > -- > MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
