On Wed, Apr 5, 2017 at 12:27 PM, NeilBrown <neilb@xxxxxxxx> wrote: > On Tue, Apr 04 2017, Christoph Hellwig wrote: > >> Looks fine, >> >> Reviewed-by: Christoph Hellwig <hch@xxxxxx> >> >> But if you actually care about performance in any way I'd suggest >> to use the loop device in direct I/O mode.. > > The losetup on my test VM is too old to support that :-( > I guess it might be time to upgraded. > > It seems that there is not "mount -o direct_loop" or similar, so you > have to do the losetup and the mount separately. Any thoughts on I guess the 'direct_loop' can be added into 'mount' directly? but not familiar with mount utility. > whether that should be changed ? There was sysfs interface for controling direct IO in the initial submission, but looks it was reviewed out, :-) Thanks, Ming Lei
