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[News] Linux Works on Timing Issues, Windows Carries Same Old Issues

  • Subject: [News] Linux Works on Timing Issues, Windows Carries Same Old Issues
  • From: Roy Schestowitz <newsgroups@xxxxxxxxxxxxxxx>
  • Date: Fri, 07 Sep 2007 13:24:16 +0100
  • Newsgroups: comp.os.linux.advocacy
  • Organization: Netscape / schestowitz.com
  • User-agent: KNode/0.10.4
Linux: DeskOpt, "Completely Unfair Scheduling"

,----[ Quote ]
| "Completely fair scheduling is [a] really good thing, but if you want the 
| best performance for certain applications you need to tune up some things," 
| explained Michal Piotrowski in his announcement for the fifth version of his 
| DeskOpt daemon.    


The biggest usability bug in Windows

,----[ Quote ]
| To that lofty end, I'm going to step down from my dramatic soliloquy and 
| ask "Why in the name of all that is holy does it have to take so long to 
| start Windows?"  



[Vista scheduler is broken]

,----[ Quote ]
| Critical optimizations such as zero-copy aside, there is no excusable reason 
| why processing IP packets should so damagingly affect the system.  
| [...]
| Putting aside the larger problem for the moment, there are several issues 
| with this solution. It prioritizes multimedia playback over networking 
| performance, which, as the resulting clamor has shown, is not everyone's 
| personal policy preference. It is almost assuredly a layering violation. It 
| picks a fixed and hard-coded packet limit (ten per millisecond), which won't 
| scale across different hardware—think significantly faster processors or 
| substantially slower networking drivers. It ignores the commonality of GigE. 
| And, finally, the solution is complicated, as the convoluted description and 
| resulting bugs in the implementation demonstrate.        


Linux: Discussing the Really Fair Scheduler

,----[ Quote ]
| Ingo Molnar reviewed Roman Zippel's Really Fair Scheduler code, suggesting 
| that much of the work was similar to that which was being done by Peter 
| Zijlstra  


Linux: The Really Fair Scheduler

,----[ Quote ]
| He offered a mathematical overview of how his new scheduler works, included 
| some benchmarks, and reflected back to earlier discussions on the lkml...


Linux: The Original Process Scheduler

,----[ Quote ]
| In a June of 1992 posting to the linux-activists mailing list, Linus Torvalds 
| described the original Linux scheduler noting, "the scheduler in linux is 
| pretty simple, but does a reasonably good job at giving good IO response 
| while not being too unfair against cpu-bound processes."   
| [...]
|  *  1996-12-23  Modified by Dave Grothe to fix bugs in semaphores and
|  *              make semaphores SMP safe
|  *  1998-11-19  Implemented schedule_timeout() and related stuff
|  *              by Andrea Arcangeli
|  *  2002-01-04  New ultra-scalable O(1) scheduler by Ingo Molnar:
|  *              hybrid priority-list and round-robin design with
|  *              an array-switch method of distributing timeslices
|  *              and per-CPU runqueues.  Cleanups and useful suggestions
|  *              by Davide Libenzi, preemptible kernel bits by Robert Love.
|  *  2003-09-03  Interactivity tuning by Con Kolivas.
|  *  2004-04-02  Scheduler domains code by Nick Piggin
|  *  2007-04-15  Work begun on replacing all interactivity tuning with a
|  *              fair scheduling design by Con Kolivas.
|  *  2007-05-05  Load balancing (smp-nice) and other improvements
|  *              by Peter Williams
|  *  2007-05-06  Interactivity improvements to CFS by Mike Galbraith
|  *  2007-07-01  Group scheduling enhancements by Srivatsa Vaddagiri


Linux: Tuning CFS

,----[ Quote ]
| Nick Piggin used 'git bisect' to track a lmbench regression to the main CFS 
| commit, leading to an interesting discussion between Nick and Ingo Molnar.  


Linux: CFS and 3D Gaming

,----[ Quote ]
| Some of the concerns expressed about the Completely Fair Scheduler were 
| reports that it might not handle 3D games as well as the SD scheduler. 


CFS scheduler to appear in Linux kernel 2.6.23

,----[ Quote ]
| And also credit where credit's due, Con Kolivas was the first one to 
| prove via RSDL/SD that 'fair scheduling' is possible and that it 
| results in better desktop scheduling.


Linux: Linus On CFS vs SD

,----[ Quote ]
| "People who think SD was 'perfect' were simply ignoring reality," Linus 
| Torvalds began in a succinct explanation as to why he chose the CFS scheduler 
| written by Ingo Molnar instead of the SD scheduler written by Con Kolivas.  


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