linux-kernel - Re: v2.6.19-rt6, yum/rpm

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Message-Id: <1165527723.9244.45.camel@cmn3.stanford.edu>
Date:	Thu, 07 Dec 2006 13:42:03 -0800
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	nando@...ma.Stanford.EDU, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org, Mike Galbraith <efault@....de>,
	Clark Williams <williams@...hat.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Giandomenico De Tullio <ghisha@...il.it>
Subject: Re: v2.6.19-rt6, yum/rpm

On Thu, 2006-12-07 at 13:07 -0800, Fernando Lopez-Lezcano wrote:
> On Thu, 2006-12-07 at 21:58 +0100, Ingo Molnar wrote:
> > * Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> wrote:
> > 
> > > Much better performance in terms of xruns with Jackd. Hardly any at 
> > > all as it should be. I'm starting to test -rt8 right now.
> > > 
> > > Now, I still don't have an smp machine to test so the improvement 
> > > could be because I'm just running 64 bit up instead of smp. Or it 
> > > could have been the hardware on that other machine that had some 
> > > problem (either because it was starting to fail or because the kernel 
> > > drivers for that hardware were somehow triggering the xruns).
> > 
> > i think it's the UP vs. SMP difference. We are chasing some SMP 
> > latencies right now that trigger on boxes that have deeper C sleep 
> > states. idle=poll seems to work around those problems.
> 
> Oh well, it looked too good, anyway, it is winter here so the extra
> heating should be fine :-)

Hmmm, when I was testing on smp I was running with the speed set to the
top speed of the processors (through the small gnome cpuspeed applet). I
imagine that the C states would not have been the problem...

-- Fernando


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