Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin andothers)

[Peter Williams]

spaminos-ker@xxxxxxxxx wrote:
> --- Peter Williams <pwil3058@xxxxxxxxxxxxxx> wrote:
>
>
> > Could you try it in "pb" mode with both max_ia_bonus and max_tpt_bonus 
> > set to zero?  That will disable all "priority" fiddling and tasks should 
> > just round robin at a priority determined solely by their "nice" value 
> > and since (according to your earlier mail) all the daemons have the same 
> > "nice" value they should just round robin with each other.
>
>
>
> Hi, I tried the latest  V-5.0 patch over 2.6.8.1 in these conditions with the
> actual server subsystem, and I get components timeouts :(
> I also ran the watchdog script on the box while running the test, and saw
> deltas of around 3 seconds every few hours:
>
> Tue Aug 24 03:02:13 PDT 2004
>
> > > > > > > > delta = 3
>
> Tue Aug 24 05:50:14 PDT 2004
>
> > > > > > > > delta = 3
>
> Tue Aug 24 09:05:24 PDT 2004
>
> > > > > > > > delta = 4
>
> Tue Aug 24 09:06:20 PDT 2004
>
> > > > > > > > delta = 4
>
> Tue Aug 24 09:36:22 PDT 2004
>
> > > > > > > > delta = 3
>
> Tue Aug 24 10:20:16 PDT 2004
>
> > > > > > > > delta = 3
>
> Tue Aug 24 13:28:19 PDT 2004
>
> > > > > > > > delta = 3
>
>
> Could I do something more useful than just displaying those deltas? Maybe I
> could dump the process list in some way, or enable some debugging code in the
> kernel to find out what is going on?

You could try Lee Revell's (rlrevell@xxxxxxxxxxx) latency measuring 
patches and also try applying Ingo Molnar's (mingo@xxxxxxx) 
voluntary-preempt patches.

Peter
--
Peter Williams                                   pwil3058@xxxxxxxxxxxxxx

"Learning, n. The kind of ignorance distinguishing the studious."
 -- Ambrose Bierce

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