On Wednesday 11 November 2009 06:41:58 Farkas Levente wrote:
> On 11/11/2009 11:53 AM, Richard W.M. Jones wrote:
> > On Wed, Nov 11, 2009 at 10:14:21AM +0000, Richard W.M. Jones wrote:
> >> echo input | time cpio --quiet -o -H newc > /path/to/fs/output
> >
> > Update: I found the -C option that lets me specify the blocksize, and
> > raising it to something sensible (65536) shows major improvements in
> > performance for all filesystems.
> >
> > echo input | time cpio -C 65536 --quiet -o -H newc > /path/to/fs/output
> >
> >> tmpfs 0.77 s x 1.0
> >> ext2 1.12 s x 1.5
> >> xfs 1.66 s x 2.1
> >> ext3 2.58 s x 3.4
> >> ext4 5.59 s x 7.3 <----
> >
> > The new times are:
> >
> > tmpfs 0.20 s x 1.0
> > ext2 0.30 s x 1.5
> > xfs 0.41 s x 2.1
> > ext3 0.57 s x 2.9
> > ext4 0.44 s x 2.2
>
> imho it's still a bug. wouldn't somehow rise the default or make the
> writes buffered or ... since the current situation is not correct.
>
I am not sure if this is related or not ...
During the F12 development cycle, I have done a number of installs on both
bare hardware and qemu-kvm guests.
In all cases, I have formatted the root ("/") partition as ext4. I have
noticed that formatting the partition for ext4 seems to take considerably more
wall-clock time for ext4 partitions than my previous experience with ext3
partitions.
I do not know if this is because ext4 "formatting" needs to do a lot more work
than ext3 or if there is a performance issue.
Gene
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