On Fri, 9 Sep 2011, Kevin Wolf wrote: > Am 08.09.2011 18:36, schrieb Sage Weil: > > On Thu, 8 Sep 2011, Kevin Wolf wrote: > >> Am 08.09.2011 01:06, schrieb Yehuda Sadeh: > >>> The following set of patches improve the qemu-img conversion process > >>> performance. When using a higher latency backend, small writes have a > >>> severe impact on the time it takes to do image conversion. > >>> We switch to using async writes, and we avoid splitting writes due to > >>> holes when the holes are small enough. > >>> > >>> Yehuda Sadeh (2): > >>> qemu-img: async write to block device when converting image > >>> qemu-img: don't skip writing small holes > >>> > >>> qemu-img.c | 34 +++++++++++++++++++++++++++------- > >>> 1 files changed, 27 insertions(+), 7 deletions(-) > >>> > >> > >> This doesn't seem to be against git master or the block tree. Please rebase. > >> > >> I think that commit a22f123c may obsolete your patch 2/2. > > > > With git.kernel.org down, where should I be looking for the latest > > upstream? > > qemu has never been on kernel.org. The interesting repositories for you are: > > * Upstream: git://git.qemu.org/qemu.git master > * Block development branch: git://repo.or.cz/qemu/kevin.git block Oh right. I've been working from qemu-kvm.git. I've done some (still minimal) testing, and it looks like the combination of a22f123c and the new writeback/flush stuff in librbd gets the same result as doing async io explicitly from qemu-img.c. Want to take a look, Yehuda? It still defaults to off, so you'll need to add rbd_writeback_window=8000000 or similar to the rbd device string. Thanks! sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
