Re: 2.5.47 scheduler problems?

Tim Connors
2002-11-18T06:44:53Z

In linux.kernel, you wrote:
> Greetings,
>
> For testing swap throughput, I like to run make -j30 bzImage on my 500Mhz
> PIII w. 128Mb ram. For testing interactivity, I fire up KDE, start a
> smaller make -j, grab a window, and wave it around.
>
> With 2.4.20rc2+rc1aa1, running a -j10 build (not swapping) is very very
> bad. However, if I set all tasks in the system to SCHED_FIFO or SCHED_RR
> prior to this light make -j, I have a ~pretty smooth system.
>
> If I do the same in 2.5.47, I have no control of my box. Setting all tasks
> to SCHED_FIFO or SCHED_RR prior to starting make -j10 bzImage, I can regain
> control, but interactivity under load is basically not present.

Funny that.

> I used to be able to wave a window poorly at make -j25 (swapping heftily),
> fairly smoothly at make -j20, and smoothly at make -j15 or below. This
> with no SCHED_RR/SCHED_FIFO. (I haven't done much testing like this in
> quite a while though)

Perhaps you should consider buying an extra 29 CPU's for you desktop?

--
TimC -- http://astronomy.swin.edu.au/staff/tconnors/

A Chemist who falls in acid is absorbed in work.