On Wed, Nov 11, 2009 at 01:24:20PM -0600, Eric Sandeen wrote:
Anybody got actual numbers? I don't disagree that mkfs.ext4 is slow in the default config, but I don't think it should be slower than mkfs.ext3 for the same sized disks.
Easy with guestfish:
$ guestfish --version guestfish 1.0.78 $ for fs in ext2 ext3 ext4 xfs jfs ; do guestfish sparse /tmp/test.img 10G : run : echo $fs : sfdiskM /dev/sda , : time mkfs $fs /dev/sda1 ; done ext2 elapsed time: 5.21 seconds ext3 elapsed time: 7.87 seconds ext4 elapsed time: 6.10 seconds xfs elapsed time: 0.45 seconds jfs elapsed time: 0.78 seconds
Note that because this is using a sparsely allocated disk each write to the virtual disk is very slow. Change 'sparse' to 'alloc' to test this with a non-sparse file-backed disk.
Rich.