On Tue, 2004-08-24 at 03:24, Nifty Hat Mitch wrote:
> > Do you have any idea what command lines I'd use to chose a scheduler
> > option? I've seen sched.c, and a flock of scheduler programs....I just
> > don't really know how to chose'em.
> >
>
> Some of these are compile time options.
> If you look at /usr/src/linux-2.6.8-1.521/kernel/sched.c
> you will see:
> #ifdef CONFIG_PREEMPT
> and other pre processor directives....
>
> More valuable may be "tuning knobs"
>
> /*
> * These are the 'tuning knobs' of the scheduler:
> *
> * Minimum timeslice is 10 msecs, default timeslice is 100 msecs,
> * maximum timeslice is 200 msecs. Timeslices get refilled after
> * they expire.
> */
> #define MIN_TIMESLICE ( 10 * HZ / 1000)
> #define MAX_TIMESLICE (200 * HZ / 1000)
> ... etc.
>
> The scheduler is at the heart of thing so do not expect to find a
> handful of plugins that work. One thing the scheduler MUST do, is
> not lockup the system. The way the scheduler works in many
> ways defines how other parts of the kernel must work.
>
> In one regard almost anything can be queued, sliced diced, scheduled:
> Network IO, disk, character io, process run time, threads... The key
> is that you want it to be ready or to happen when you need it and it
> is hard to please all the people all the time. Remember that some
> things demand strict ordering.
>
> Of interest all these scheduling ideas can be applied to user space
> applications. Things like the Xserver... data base engines, web server,
> and more.
Well, since I'm doing things that 'everyone' does (the usual email,
watching tv, surfing, and gaming) I don't expect any tuning- I'm just
planing to try the 4-5 main 'types' and take the best of them.
Of course, if I try them all out with default values and the problem
never leaves, I'm screwed...but surely there are enough people doing the
same thing I am and as time goes by we'll have more information on
it...I hope.
--
------------------------------------------------------------------------
Brian FahrlÃnder Christian, Conservative, and Technomad
Evansville, IN http://www.fahrlander.net
ICQ 5119262
AIM: WheelDweller
------------------------------------------------------------------------
Attachment:
signature.asc
Description: This is a digitally signed message part
