ULE and very bad responsiveness

Jeff Roberson jroberson at chesapeake.net
Fri Nov 14 11:54:16 PST 2003


On Fri, 14 Nov 2003, Jonathan Fosburgh wrote:

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> On Thursday 13 November 2003 06:01 pm, Harald Schmalzbauer wrote:
>
> > I also could play quake(2) and have something compiling in the background
> > but I see every new object file in form of a picture freeze. Also every
> > other disk access seems to block the whole machine for a moment.
> > I'll try again if somebody has an idea what's wrong. Then I can try running
> > seti wtih nice 20 but that's not really a solution. It's working perfectly
> > with nice 15 and the old scheduler.
> >
>
> I see something similar, as a file is generated during a compile a get a
> momentary hang in the mouse, but it is not every compile.  I think I see it
> mostly when running some invocation of make -j, but I've not been able to
> lock down a particular set of circumstances where I do see it.  My
> sched_ule.c is at 1.80.  I have a UP system.  This behaviour, intermittant
> though it is, persists across a normal UP kernel, and also one with SMP+APIC
> (I was *supposed* to have two CPUs, but that is another issue ...) enabled. I
> have a PS/2 mouse and use moused.  I'm running KDE3.1.4.

This does not happen with SCHED_4BSD?  How fast is your system?  Can you
give me an example including what applications you're running and what
you're compiling?

> - --
> Jonathan Fosburgh
> AIX and Storage Administrator
> UT MD Anderson Cancer Center
> Houston, TX
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