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From: Rob Landley <rob@landley.net>
To: George Anzinger <george@mvista.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Ingo Molnar and Con Kolivas 2.6 scheduler patches
Date: Wed, 13 Aug 2003 20:24:36 -0400	[thread overview]
Message-ID: <200308132024.36967.rob@landley.net> (raw)
In-Reply-To: <3F355F12.4040609@mvista.com>

On Saturday 09 August 2003 16:52, George Anzinger wrote:
> Ed Sweetman wrote:
> > the problem is you want a process that works like it was run on a single
> > tasking OS on an operating system that is built from the ground up to be
> >  a multi-user multi-tasking OS

Considering the multi-tasking OS has 1000 times the CPU power, memory, and 
disk space as the single-tasking OS did when it debuted, yet still loses to 
it in some areas, isn't it at least worth looking at?

> > and you want both to work perfectly at peak performance

We're pondering various heuristics with which to to improve the situation and 
you say we're persuing perfection.  From heuristics.

Do you say these sort of things to the virtual memory people?  (Since you 
can't do it perfectly, why bother to swap at all?  The perfect being the 
enemy of the good, and all that.)

> > and you want it to know when you want which to work at
> > peak performance automatically.

I know for a fact that automatic determination of interactivity is possible.  
In OS/2 you could speed up a compile by  moving the mouse pointer over its 
window repeatedly to give it extra clock ticks.  (So far we've managed to 
avoid anything quite so disgusting in Linux, but there exist OSes where it 
was done.  Having the keyboard and mouse and display be local devices is 
actually the common case.  It took X about ten years to finally start 
optimizing for the common case on the output side with MIT shared memory 
extensions and such...)

The scheduler actually has a lot of information to work with.  Ingo's patches 
strive to give it more information, and and Con's patches make much better 
use of that information.  This is a good thing.

> Well said :)

Actually, I didn't really consider that list of straw man arguments to be 
worth commenting on the first time around.  (I thought he was being 
sarcastic...)

Rob

  reply	other threads:[~2003-08-14  0:22 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-26  9:30 Ingo Molnar and Con Kolivas 2.6 scheduler patches Felipe Alfaro Solana
2003-07-26  9:46 ` Marc-Christian Petersen
2003-07-26 10:02   ` Ismael Valladolid Torres
2003-07-26 10:10     ` Eugene Teo
2003-07-26 11:24       ` Ed Sweetman
2003-07-26 17:00         ` Rahul Karnik
2003-07-27 15:46         ` Daniel Phillips
2003-07-26 16:52           ` Diego Calleja García
2003-07-26 18:35           ` Andrew Morton
2003-07-26 23:01             ` Diego Calleja García
2003-07-28  9:38               ` Felipe Alfaro Solana
2003-07-28 10:37                 ` Måns Rullgård
2003-07-28 17:06                 ` Diego Calleja García
2003-07-27  2:38             ` Con Kolivas
2003-07-27  7:39               ` Willy Tarreau
2003-07-27  9:12                 ` Ingo Molnar
2003-07-27 11:54                   ` Con Kolivas
2003-07-27 20:18             ` Daniel Phillips
2003-07-26 22:05               ` Ed Sweetman
2003-08-01 15:38                 ` Daniel Phillips
2003-07-31 23:02                   ` Ed Sweetman
2003-07-27  2:39               ` Ed Sweetman
2003-07-29 13:56               ` Timothy Miller
2003-07-29 13:57                 ` Con Kolivas
2003-07-29 15:30                   ` Timothy Miller
2003-07-29 15:52                 ` Helge Hafting
2003-07-29 16:26                   ` Timothy Miller
2003-07-30 14:46                 ` Daniel Phillips
2003-07-29 15:40                   ` Timothy Miller
2003-07-30 16:17                     ` Daniel Phillips
2003-08-08 21:09                   ` Bill Huey
2003-08-06 21:28           ` Rob Landley
2003-08-07  9:34             ` Helge Hafting
2003-08-07 15:42             ` Daniel Phillips
2003-08-07 20:45               ` William Lee Irwin III
2003-08-07 20:51               ` Rob Landley
2003-08-07 21:40                 ` Ed Sweetman
2003-08-07 22:17                   ` William Lee Irwin III
2003-08-08  0:01                   ` Rob Landley
2003-08-09 20:52                   ` George Anzinger
2003-08-14  0:24                     ` Rob Landley [this message]
2003-08-14  8:01                       ` George Anzinger
2003-08-16  9:10                         ` Rob Landley
2003-08-16 14:29                           ` APM and 2.5.75 not resuming properly Jamie Lokier
2003-08-16 15:03                             ` Stephen Rothwell
2003-08-16 16:12                               ` Jamie Lokier
2003-08-16 20:43                             ` Rob Landley
2003-08-13  3:38                   ` Ingo Molnar and Con Kolivas 2.6 scheduler patches George Anzinger
2003-08-08  6:08                 ` Daniel Phillips
2003-07-26 12:08       ` Ismael Valladolid Torres
2003-07-26 14:54         ` Con Kolivas
2003-07-26 14:49     ` Con Kolivas
2003-07-26 14:47   ` Con Kolivas
2003-07-26 16:42     ` Lou Langholtz
2003-07-26 16:40       ` Jens Axboe
2003-07-26 18:19   ` William Lee Irwin III
2003-07-26 18:31     ` Felipe Alfaro Solana
2003-07-26 19:20       ` William Lee Irwin III
2003-07-26 19:47       ` William Lee Irwin III
2003-07-27  9:24 ` Ingo Molnar
2003-07-27  9:57   ` Con Kolivas
2003-07-27 10:02     ` Ingo Molnar
2003-07-27 10:19       ` Con Kolivas
2003-07-28 22:44     ` Timothy Miller
2003-07-26 14:44 Downing, Thomas

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