Re: [ck] CPU load balance or one task domination under linux-2.6.7-ruby-s77

[Con K. <ke...@ko...>]

Aivils wrote:
> Hi All!
> 
> 	I try multiple local user linux box.
> All 2.6.XX kernel versions from 2.6.0 up to 2.6.7 do one task domination.
> I applay before staircase 7 and now staircase 7.7
> 
> Anyway if two users run games simultaneous, then one game allways
> dominate.
> If i set "nice -n +1 game-bin"  for each user , then both games
> became choppy, because lost priority against system tasks.
> 
> Second phenomen - tuxracer under 2.4.26 take 1%-3% CPU time,
> but under 2.6.7-s77 it eat 80%. As result i cannot test thiny games
> simultaneous, because thiny goes fat and choppy.
> 
> Does know anybody is this phenomen realy depended from task
> scheduler alghoritm?
> 
> May be that is system call queue?

Hi

Please try staircase7.8 and use
echo 0 > /proc/sys/kernel/interactive

cpu time accounting can be out by a great margin changing Hz (as happens 
between 2.4 and 2.6). Higher Hz will always show higher cpu usage even 
if the usage is the same. If a task waes up at just the right time 
frequently enough it can appear to use 10 times as much cpu.

Con