On Thu, Apr 08, 2010 at 06:28:54PM +0300, Avi Kivity wrote: > On 04/08/2010 06:26 PM, Chris Mason wrote: > >> > >>>Once the O_DIRECT read patch is in, you can switch to that, or tell qemu > >>>to use a writeback cache instead. > >>Even with writeback qemu will issue a lot of fsyncs. > >Oh, I didn't see that when I was testing, when does it fsync? > > When it updates qcow2 metadata or when the guest issues a barrier. > It's relatively new. I have a patch that introduces cache=volatile > somewhere. Ok, that's actually perfect. I'll retest with that if I can get qemu-git to work here. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
