Re: [ANNOUNCE][RFC] PlugSched-6.1.6 for 2.6.15-rc5 and 2.6.15-rc5-mm2

From: Peter Williams
Date: Thu Dec 15 2005 - 18:27:18 EST


Peter Williams wrote:
This version features a major gutting of the SPA based schedulers to reduce overhead. The inclusion of the mechanisms for gathering and displaying accrued scheduling statistics have been made a compile time configurable option (default is exclusion) as they are not an integral part of the scheduler and were mainly there to help with tuning. In a future version they will be removed completely.

Additionally, the mechanism for auto detection and preferential treatment of media streamers in the spa_ws scheduler has been made a compile time option (default is exclusion). The reason for this is that my testing shows that the performance of media streamers on spa_ws is adequate without it. This will also be removed in a future version unless requested otherwise.

A patch for 2.6.15-rc5 is available at:

<http://prdownloads.sourceforge.net/cpuse/plugsched-6.1.6-for-2.6.15-rc5.patch?download>


and a patch for 2.6.15-rc5-mm2 is available at:

<http://prdownloads.sourceforge.net/cpuse/plugsched-6.1.6-for-2.6.15-rc5-mm2.patch?download>

This applies cleanly to 2.6.15-rc5-mm3 so no new patch for that kernel will be posted.



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 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@xxxxxxxxxxxxxx

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