Re: [PATCH]: O(1) 2.4.17-J7 Tuneable Parameters

[Martin Knoblauch]

> [PATCH]: O(1) 2.4.17-J7 Tuneable Parameters
> 
> 
> Hi Ingo,
> 
>         This patch synchronizes with J7 and I think makes the changes
> you wished. A couple of important points:
> 
>                 - This patch can be applied to EITHER 2.4.17 OR 2.4.18 pre 7 as
>                         long as Ingo's J7 patch is applied first.
> 
>                 - While I agree with you on not wanting these in the mainline kernel,
>                         I ran Hackbench on one of our new Foster systems with and
>                         without the tuneable parameters, and while the numbers do
>                         degrade slightly, its rather suprisingly small. So dont be afraid
>                         to use this as a system tuning aid.
> 

 How big is the actual degradation in your test? IIR, Ingo is afraid
that the tunables could easily screw things up, which of course is true.
What about adding a kernel-build option that leaves the sysctl interface
read-only by default and enables writing only if it is requested at
build time?

 That way the external interface stays constant.

Martin
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