Re: [ANNOUNCE][RFC] PlugSched-6.2 for 2.6.16-rc1 and 2.6.16-rc1-mm1

[Peter Williams <pwil3058@bigpond.net.au>]

Peter Williams wrote:
> This version continues the major gutting of the SPA based schedulers to
> reduce overhead.  The inclusion of the mechanisms for gathering and
> displaying accrued scheduling statistics have been remove as they are 
> not an integral part of the scheduler and were mainly there to help with 
> tuning.  Sorry Jake, if you still need these for your genetic algorithm 
> work I can provide a patch to add them to all schedulers?
>
> Additionally, the mechanism for auto detection and preferential
> treatment of media streamers in the spa_ws scheduler has been removed. 
> The reason for this is that my testing shows that the performance of 
> media streamers on spa_ws is adequate without it.
>
> Modifications have been made to spa_ws to (hopefully) address the issues 
> raised by Paolo Ornati recently and a new entitlement based 
> interpretation of "nice" scheduler, spa_ebs, which is a cut down version 
> of the Zaphod schedulers "eb" mode has been added as this mode of Zaphod 
> performed will for Paolo's problem when he tried it at my request. 
> Paolo, could you please give these a test drive on your problem?
>
> A patch for 2.6.16-rc1 is available at:
>
> <http://prdownloads.sourceforge.net/cpuse/plugsched-6.2-for-2.6.16-rc1.patch?download> 
>
>
> and a patch for 2.6.16-rc1-mm1 is available at:
>
> <http://prdownloads.sourceforge.net/cpuse/plugsched-6.2-for-2.6.16-rc1-mm1.patch?download> 

Applies cleanly to 2.6.16-rc1-mm2.

> Very Brief Documentation:
>
> You can select a default scheduler at kernel build time.  If you wish to
> boot with a scheduler other than the default it can be selected at boot
> time by adding:
>
> cpusched=<scheduler>
>
> to the boot command line where <scheduler> is one of: ingosched,
> nicksched, staircase, spa_no_frills, spa_ws, spa_svr, spa_ebs or zaphod. 
>  If you don't change the default when you build the kernel the default 
> scheduler will be ingosched (which is the normal scheduler).
>
> The scheduler in force on a running system can be determined by the
> contents of:
>
> /proc/scheduler
>
> Control parameters for the scheduler can be read/set via files in:
>
> /sys/cpusched/<scheduler>/
>
> Peter


--
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
 -- Ambrose Bierce
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