3 Feb
2003
3 Feb
'03
2:40 p.m.
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(a)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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