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Differences in page fault cost; how to proceed

Hi All,
 
I am running lmbench version-3.0-a9 on two embedded platforms.
P1 - Xscale processor with 2.6.21.1 linux kernel
P2 - OMAP3430 processor with 2.6.24.7 linux kernel
 
 

File size

P1

P2

1MB

10.4805

8.9601  microsec

3

11.3464

17.9124

4

11.7725

22.4209

6

12.6081

 31.5996

8

13.4312

40.4351

10

14.2652

49.4035

12 MB

15.0599

58.4115

 
 
 
P1
free -m
             total       used       free     shared    buffers     cached
Mem:           109         41         67          0          2         17
-/+ buffers/cache:         21         88
Swap:            0          0          0
 
P2
free -m
             total       used       free     shared    buffers     cached
Mem:           122         43         79          0          5         22
-/+ buffers/cache:         15        107
Swap:            0          0          0
 
 
I want to know why the cost of page fault in case of P2 is more as the file size increases.
But I dont know where to start. Please give directions
 
Thanks for your time
 
Regards
Basavaraj