RTEMS 4.5 Vs 4.6 Vs Linux : Performance analysis : Further Improvements: How?

[sashti srinivasan]

Hello All,

     I have posted previously the comparison between
RTEMS 4.5 and linux, Requested ideas for improvement
of performance.  The suggestions were (1) Play with
compiler flags (2) Much improvements were done after
release of 4.5(i.e, use 4.6.).

     I could succesfully build RTEMS-4.6 for
pc686(Probably there is no missing makefile in pre-4)
using updated toolchain.

     The results of comparison between RTEMS-4.5,4.6
and linux are as given below.

---------------------Time in Microseconds--------
Time For:        RTEMS 4.6      4.5       Linux
-------------------------------------------------
Lock a Mutex        0.3         0.48        0.23
Unlock A Mutex      0.47        0.49        0.37
Create Mutex        0.83        0.90        0.08
Destroy Mutex       0.58        0.66        0.10
Semaphore Init      0.74        0.90        0.31
Semaphore Destroy   0.62        1.78        0.13
Semaphore Wait      0.37        0.37        0.32
Semaphore Post      0.46        0.51        0.32
Thread Switching    2.59        2.82       35.45
-------------------------------------------------

Details:
   CPU & BSP   :  PIII 433 MHz pc686
  Linux        :  Kernel 2.6.3
  RTEMS        :  4.6 pre-4 and 4.5

IMPROVEMENTS:
    I wish to improve the performance of rtems such
that it is close to/ better than linux.  Please
suggest me ideas for this.

    Regarding the compiler flags, I tried -mcpu=686. 
But the performance was same as that for 386.  Please
suggest me ideas for improving performance of rtems.

With Regards
Srinivasan

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