Subject: Re: [linux-audio-user] Uhm, low latency?
From: R Parker (rtp405@yahoo.com)
Date: Mon Feb 03 2003 - 20:33:15 EET
Capabilities allows a normal user to preempt
processes, otherwise only root can do that.
Are you using the ccrma? I don't. I'm sure someone
that's using it can help you to enable capabilities
for a normal user.
I think your lowlatency is OK.
The xruns can result from many factors; tuning ide HDs
with hdparm, irg ordering and latency with lspci, etc.
There's a few people that can point you to
documentation and mailing list archives where tuning a
system has been discussed.
ron
--- felipe <filippo@email.it> 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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