Re: scheduler vs hardware? (was Re: another i7 (linux) bug?)
From: Luca Zini
Date: Fri Jan 22 2010 - 15:15:17 EST
vanilla 33-rc5 runs ok:
with nice set to -20
with nice set to 19:
On Friday 22 January 2010 08:19:18 am Mike Galbraith wrote:
> > if I run a cpu intensive process with the lowest priority (19
> > from man nice) I obtain much better performance that with the
> > highest priority available (-20 from man nice).
> > For example the same file is processed by lame in 8.7 seconds
> > at the lowest priority, and in 12 seconds at the highest
> > priority. Before posting a bug I wold like to understand if
> > this is a problem related to the i7 mobile (my processor is a
> > i7 Q720).
> > As far as I tested on the same laptop series (dell studio 15),
> > with the same kernel this problem does not exists.
> So you only see this on the i7. That's odd. Can you try 33-rc5?
> Posting a reliable reproducer would be nice. It'd also be nice to see
> what all is running when you see this, and where.
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