On Oct 16, 2013, at 1:09 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > > I made the suggested cache change for both LVM and qcow2; and created the qcow2 file as suggested (adding lazy_refcount): > > Fedora 20 default standard partition guided install (ext4) to an LV takes 18m02s. Firstboot systemd-analyze: > Reboot, first boot systemd-analyze results: 852ms (kernel) + 1.425s (initrd) + 10.417s (userspace) = 12.695s > > The same install parameters to qcow2 on XFS takes 17m52s. Firstboot systemd-analyze: > 829ms (kernel) + 1.475s (initrd) + 11.693s (userspace) = 13.998s Same unsafe caching and qcow2 '-o preallocation=metadata,compat=1.1,lazy_refcounts=on' as above Fedora 20 default BTRFS guided install to qcow2 on XFS, install time 17m21s. Firstboot systemd-analyze: 874ms (kernel) + 1.558s (initrd) + 12.866s (userspace) = 15.300s The install is a tiny bit faster than the ext4 standard partitions (no LVM) result above, only difference is ext4 vs btrfs. But it's a ton faster than the originally reported btrfs to qcow2 on XFS result of 1h11m. Clearly it wasn't the file system that slowed it down. FWIW this is still /boot on ext4 not on btrfs, so kernel and initrd results are ext4 and userspace is primarily btrfs. It'd be great if virt-manager defaults to using these qcow2 options, short of them causing some sort of problem. I can't tell from the qemu-img info command what options were used to create the file. Chris Murphy -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
