Re: [PATCH 1/1] indirect function calls elimination in IO scheduler

[Arjan van de Ven]

On Wed, 2005-10-19 at 17:08 +0400, Ananiev, Leonid I wrote:
> >From Leonid Ananiev
> 
>       Fully modular io schedulers and enables online switching between
> them was introduced in Linux 2.6.10 but as a result percentage of CPU
> using by kernel was increased and performance degradation is marked on
> Itanium. A cause of degradation is in more steps for indirect IO
> scheduler type specific function calls.
>       The patch eliminates 45 indirect function calls in 16 elevator
> functions. 

does it really reduce those function calls? I thought it only reduced a
few pointers to be followed, but not the actual indirect function calls!



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