Re: 2.5.64-mm6, a new test case for scheduler interactivity problems

[Felipe Alfaro Solana]

----- Original Message ----- 
From: Charles Baylis <[e-mail]> 
Date: 	Thu, 13 Mar 2003 22:01:02 +0000 
To: [e-mail] 
Subject: 2.5.64-mm6, a new test case for scheduler interactivity problems 
 
> I've just installed 2.5.64-mm6, and I've tried out the new improved  
> scheduler and it's definately not there yet. I can easily cause ogg  
> playback to skip (for example) by changing virtual desktop in windowmaker  
> to busy konqueror window. X is not reniced (has a nice level of 0) 
 
I cannot reproduce your problems... same scenario: 2.5.64-mm6, 
KDE desktop, XFree86 4.3.0 (no nice). 
 
> My experience suggests that skips occur when more than one interactive task  
> starts to become a CPU hog, for example X and konqueror can be idle for  
> long periods, and so become interactive, but during an intensive redraw  
> they briefly behave as CPU hogs but maintain their interactive bonus this  
> means that ogg123 has to wait until the hogs complete their timeslice  
> before being scheduled. 
 
Can't reproduce... 
 
> My test case tries to reproduce this by creating a number of tasks which  
> alternate between being 'interactive' and CPU hogs. On my Celery 333 laptop  
> it can sometimes cause skips with only 1 child, and is pretty much  
> guaranteed to cause skips with more child tasks. 
 
I have a Pentium III Mobile 700 Mhz, anyways... 
 
> To compile use 'gcc -o thud thud.c' 
>  
> To reproduce, I: 
> run ogg123 somefile.ogg in one xterm 
> run ./thud 1 in another xterm 
 
No ways... I start ogg123 to reproduce a very long file and then, 
launched ./thud 20 (yes, 20, but I also tried with 2 and 1), but 
ogg123 doesn't skip. No way, I can't make it skip. 
 
Try doing 
 
echo 50 > /proc/sys/sched/max_timeslice 
 
and see if it helps. 
Thanks! 
 
   Felipe 
 
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