[ANNOUNCE][RFC] PlugSched-6.3 for 2.6.16-rc2 and 2.6.16-rc2-mm1

From: Peter Williams
Date: Thu Feb 09 2006 - 19:21:11 EST


This version introduces a new scheduler, ingo_ll, which is a modification of ingosched that uses average latencies to determine the interactive bonuses awarded to tasks. In effect, tasks only receive bonuses if they are necessary for the task to achieve satisfactory latencies. For tasks waking from "interactive" sleeps their average interactive latency is compared to a fixed limit and if it exceeds this amount then their bonus is increased (if not it is compared to the same limit divided by 2^8 and if it is smaller than this the bonus is reduced). The limit may be set via the sysfs file /sys/cpusched/ingo_ll/unacceptable_ia_latency. A similar process is conducted for tasks waking from "non interactive" sleep except that the limit is adjusted to take account of the number of tasks running on the same CPU.

This version also continues the major gutting of the SPA based schedulers to reduce overhead.

A patch for 2.6.16-rc2 is available at:

<http://prdownloads.sourceforge.net/cpuse/plugsched-6.3-for-2.6.16-rc2.patch?download>

and a patch for 2.6.16-rc2-mm1 is available at:

<http://prdownloads.sourceforge.net/cpuse/plugsched-6.3-for-2.6.16-rc2-mm1.patch?download>

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, ingo_ll, 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@xxxxxxxxxxxxxx

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