Avi Kivity wrote:
For the case where the file is actually a partition, use
submit_bio(). When the file is a file, keep it in qemu, that path is
going to be slower anyway.
[CUT]
Christoph Hellwig wrote:
On Tue, Mar 23, 2010 at 12:03:14PM +0200, Avi Kivity wrote:
I also think it should be done at the bio layer. File I/O is going to
be slower, if we do vhost-blk we should concentrate on maximum
performance. The block layer also exposes more functionality we can use
(asynchronous barriers for example).
The block layer is more flexible, but that limits you to only stack
directly ontop of a block device, which is extremly inflexible.
Would the loop device provide the features of a block device? I recall
barrier support at least has been added recently.
Is it recommended to run kvm on a loopback mounted file compared to on a
raw file?
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