Why F15 has up to 50% worse disk performance than Ubuntu ?

[JB]

Alan Cox <alan <at> lxorguk.ukuu.org.uk> writes:

> ...
> Equally if Fedora has soem crappy background app that keeps writing
> little bits of pointless data to the disk every second that'll do the job
> nicely too.

I think you did not make this comment out of the blue ?
So why not bring it (them) into the light and knock around a bit ?
Btw, would that apply to kernel daemons as well ?

> ...

Below are two comments relevant to test results.

http://phoronix.com/forums/showthread.php?54939-Is-Fedora-15-Faster-Than-Ubuntu-11.04

AdamW
...
Also it'd be interesting to know if you kept the OS default partitioning scheme
(in which case the Fedora install would likely have an LVM layer the Ubuntu one
would not.)

Yes, defaults.
...

Ard Righ
Junior Member
Default Default LVM partitions
One of the annoyances of Fedora, is the LVM-by-default install pattern that
is used, which is great for desktops, and possibly basic servers, but
generally sucks arse for laptops.
And LVM will always kill performance.
I am fairly sure removing LVM would even the disk performance numbers up to
minimal differences. 

JB