LPAR - micro partitioning an i5-520

[Philipp Rusch <philipp.rusch@xxxxxxxxxxxxxxx>]

Hello *ALL,
would someone be so kind to explain some LPAR-details to me ?
I tried to configure LPARs with Virtual Partition Manager for a quite 
simple goal:
Given a one processor i5-520-machine,  i5-OS V5R3 or V5R4 we want to add
one or more Linux partitions.
Why is the number of processor units = 0.32 ???
Does this mean, I won't be able to give my linux partition a tenth of 
processor
power, because I am not able to divide my 0.32 to something smaller than
0.22 units for my i5-OS partition and 0.10 units for my Linux ?
I always thought 0.10 is the minimum for micro partitioning a single POWER5
processor and since whe have one processor its processor units have to
be 1.00 ??? What am I missing here ?
The VPM Redbook is not helpful at all ...

Any hint welcome.
Regards from Germany,
Philipp