On Oct 16, 2013, at 1:09 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > 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 >From above, two changes: 1. Use virt-manager to create the qcow2 file; 2. The source ISO is moved to a separate drive, rather than on the same drive as the qcow2 file. Fedora 20 default BTRFS guided install, to qcow2 (vmm default) on XFS, virtio, unsafe cache Install time: 16m44s So whatever options virt-manager is using to create qcow2 files, is either the same as -o preallocation=metadata,compat=1.1,lazy_refcounts=on, or any difference in options isn't making a difference in performance. The 37 second performance difference is probably due to less disk contention from the source ISO being on a separate drive this time around. And if I'm right about all of that, then the overwhelming gain is coming from unsafe cache. Chris Murphy -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
