Subject: Re: [git] CFS-devel, latest code
From: Mike Galbraith <efault@gmx.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Dhaval Giani <dhaval@linux.vnet.ibm.com>,
       Dmitry Adamushko <dmitry.adamushko@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>
In-Reply-To: <20070925094712.GA29138@elte.hu>
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	 <1190711858.13861.10.camel@Homer.simpson.net>
	 <20070925094712.GA29138@elte.hu>
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Date: Tue, 25 Sep 2007 12:02:07 +0200
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On Tue, 2007-09-25 at 11:47 +0200, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
> 
> > On Tue, 2007-09-25 at 11:13 +0200, Ingo Molnar wrote:
> > 
> > > > [...] Latencies of up to 336ms hit me during the recompile (make -j3), 
> > > > with nothing else running. Since reboot, latencies are, so far, very 
> > > > very nice. [...]
> > > 
> > > 'very very nice' == 'best ever' ? :-)
> > 
> > Yes.  Very VERY nice feel.
> 
> cool :-)
> 
> Maybe there's more to come: if we can get CONFIG_FAIR_USER_SCHED to work 
> properly then your Xorg will have a load-independent 50% of CPU time all 
> to itself. (Group scheduling is quite impressive already: i can log in 
> as root without feeling _any_ effect from a perpetual 'hackbench 100' 
> running as uid mingo. Fork bombs no more.) Will the Amarok gforce plugin 
> like that CPU time splitup? (or is most of the gforce overhead under 
> your user uid?)

I run everything as root (naughty me), so I'd have to change my evil
ways to reap the benefits.  (I'll do that to test, but it's unlikely to
ever become a permanent habit here)  Amarok/Gforce will definitely like
the user split as long as latency is low.  Visualizations are not only
bandwidth hungry, they're extremely latency sensitive.

	-Mike

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