Re: hackbench: 2.6.12-rc6 vs. 2.6.12-rc6-RT-V0.7.48-06

[Esben Nielsen <simlo@phys.au.dk>]

On Fri, 10 Jun 2005, Gabor MICSKO wrote:

> Hi!
> 
> I made some test with 2.6.12-rc6-RT-V0.7.48-06 and 2.6.12-rc6 kernels.
> Here is my results:
> 
> 2.6.12-rc6-RT-V0.7.48-0			       2.6.12-rc6
> ------------------------------------			    ----------------	
> 
> ./hackbench 30
> 
> 1st run:  6.139					    5.110	
> 2nd run: 6.119					   4.946
> 3rd run: 6.135					    5.168
> 
> ./hackbench 100
> 
> 1st run:  23.254				   16.603	
> 2nd run: 23.481					  16.478
> 3rd run:  23.790				   16.387
> 
> ./hackbench 130
> 
> 1st run:  33.395				   21.731	
> 2nd run: 32.652					  21.821
> 3rd run:  32.517				   21.698
> 
> ./hackbench 150
> 
> 1st run:  89.100				   47.862	
> 2nd run: 39.308					  25.121
> 3rd run:  90.157				   25.125
> 
> It seems to me 2.6.12-rc faster than 2.6.12-rc6-RT-V0.7.48-0. It is
> normal? 

Depends on the configuration options. If you used the same configs they 
should be the same but if you activated PREEMPT_RT it should slow things
down due to the overhead of irq-threading and  mutexes instead of
spinlocks - although I am surprised the factor is _that_ big!

Esben

> 
> thanks,
> 
> -
> mg
> 

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