Changing default root filesystem to ext4
tixy at yxit.co.uk
Thu Aug 18 12:18:29 UTC 2011
On Wed, 2011-08-17 at 11:48 +0100, James Tunnicliffe wrote:
> On 17 August 2011 08:55, Tixy <tixy at clara.net> wrote:
> > For untaring kernel source on one of my good performance
> > SD cards on a Beagleboard-xM takes:
> > m s
> > ext4 3:30
> > ext3 8:30
> > ext2 5:00
> > btrfs 13:40
> > nilfs 10:40
> > logfs 10:00
> > this is using default mount options for file system but with noatime.
> > These timings also bear out preliminary results from my simulation code.
> > Which I'm glad of :-)
> This is odd. When I performed tests btrfs and ext4 were both about the
> same speed for copying a mixture of large and small files to.
I didn't have btrfs-tools (nor nilfs nor logfs) installed. My test
script didn't notice that mkfs failed because I was piping the output
through tee, (which, being the end of the pipeline, always gave a
This all resulted in my tests being re-run on the last file system
(ext2) which is a interesting result in itself as it shows a lot worse
performance compared to a fresh partition. (This is the sort of thing we
expected and is on the list of things to investigate further.)
My new results for the untar on a Beagleboard-xM...
I couldn't test logfs because, whilst mkfs worked, the mount command (or
the kernel?) doesn't seem to support it.
I also tested the different btrfs mount options (ssd, nossd and
ssd_spread). They don't show much difference with the untar case.
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