Date: Sat, 6 Nov 2004 08:36:04 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "Michael J. Cohen" <mjc@unre.st>
Cc: sboyce@blueyonder.co.uk, linux-kernel@vger.kernel.org
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.7
Message-ID: <20041106073604.GC8285@elte.hu>
References: <1099567061.7911.4.camel@localhost> <20041104114545.GA3722@elte.hu> <1099573171.7876.0.camel@optie.uni.325i.org> <1099575262.8110.1.camel@optie.uni.325i.org> <20041104140528.GA16604@elte.hu> <1099577631.8090.4.camel@optie.uni.325i.org> <20041104142317.GA19476@elte.hu> <1099593117.7982.14.camel@optie.uni.325i.org> <20041104193819.GB10107@elte.hu> <1099684431.7964.6.camel@optie.uni.325i.org>
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* Michael J. Cohen <mjc@unre.st> wrote:

> > hm, have you chrt-ed the soundcard IRQ to a fifo priority higher than
> > 50?

> on my x86-64, there doesn't seem to be an irq for snd-intel8x0.
> 
> optie ~ # cat /proc/interrupts 

> 185:     286001   IO-APIC-level  libata, ehci_hcd, ohci_hcd, ohci_hcd
> 193:      37964   IO-APIC-level  AMD AMD8111

perhaps this IRQ 193 one? Stupid question: there is sound coming out of 
the speakers, right?

> ps ax doesn't seem to show anything sound-related except jackd so I
> tried chrt -f 75 jackd -R -d alsa -P -HMm -z s -o 6
> 
> result during an emerge metadata on V0.7.13:
> 
> **** alsa_pcm: xrun of at least 133.973 msecs
> **** alsa_pcm: xrun of at least 78.544 msecs
> **** alsa_pcm: xrun of at least 245.494 msecs
> 
> *much* better but we're shooting for 0 xruns, no?

yeah, we are.

	Ingo
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