On Mon, May 11, 2009 at 09:51:40AM -0500, Anthony Liguori wrote: > What typically triggers a flush operation? fsync. > I would assume an fsync would, but would a flush happen after every > O_DIRECT write? Right now it doesn't, but it probably should. > If the backend implementation of T_FLUSH is fsync, I would think that > this would result in rather poor performance for O_DIRECT operations in > the guest. Right now it's fsync. By the time I'll submit the backend change it will still be fsync, but at least called from the posix-aio-compat thread pool. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
