Subject: Re: [linux-audio-user] Uhm, low latency?
From: Mark Knecht (markknecht@attbi.com)
Date: Tue Feb 04 2003 - 02:58:29 EET
Felipe,
I believe that the low latency patches and the capability patches are
actually separate. You could have low latency, but not have
capabilities.
The PlanetCCRMA kernel has both.
It's very possible that you are getting xruns for other reasons too,
such as a slow disk drive (assuming you are transferring data to or from
the disk when this happens) or a bad interrupt on your audio card.
lspci -v and tell us what IRQ you have for audio. Best (in my
experience) is IRQ 9, followed by 10, or 11.
Cheers,
Mark
On Mon, 2003-02-03 at 08:58, felipe wrote:
> Hi,
>
> I was stupidly sure I was running a lowlatency kernel just because my
> /proc/sys/kernel/lowlatency was set to 1.
>
> I used to start jack with something like
> $: jackd -R -d alsa -d opl3sa2 -r 44100
>
> and I was surprised by the great number of xruns. Now I tried "jackstart" as
> root and... what? This kernel does not have capabilities enabled?!
>
> I read some posts by people who got lowlatency in their laptops only after
> enabling ACPI... Could this be true for some PC's too? Has anyone faced this
> inconvenience? I've completely disabled the Power Management support.
>
> My box:
> Pentium III katmai
> 192 MB Ram
> Sound Card Yamaha opl3sa2
> hdparm -t /dev/hda -> 64MB in 4.21 secs = 15.21 MB/sec
> Debian woody + gcc3.2 + DeMuDi
> ALSA 0.9rc6
> Kernel 2.4.20-ck2 (almost: it's a 2.4.20 vanilla with Con Koliva's lowlatency,
> preemtpible and arcangeli's VM patches)
>
> Can't think of anything relevant, any idea? Thank you
>
> felipe
>
>
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