[LAU] Horrible number of xruns in Jack (Emu card)

Norval Watson norv2001 at yahoo.com.au
Mon Jan 28 19:17:34 EST 2008


I got the same processor running 64-bit debian sid running jack at 44.1khz, 64 sample buffer on Audiophile 2496 soundcard with no xruns.
Are you running realtime kernel with realtime box checked in qjackctl/settings
(or with -R option on command line)?
(I got 4GB dual-channel RAM and 2 SATA DRIVES...)
My kernel: 2.6.23.11-rt14 #1 SMP PREEMPT RT Wed Dec 26 08:47:49 EST 2007 x86_64 GNU/Linux
Norv

----- Original Message ----
From: Darren Landrum <darren.landrum at sbcglobal.net>
To: linux-audio-user at lists.linuxaudio.org
Sent: Monday, 28 January, 2008 11:42:08 PM
Subject: Re: [LAU] Horrible number of xruns in Jack (Emu card)

Darren 
Landrum 
wrote:
> 
I 
hope 
someone 
can 
help 
me 
with 
this.
> 
> 
I 
have:
> 
> 
Athlon64 
Dual-Core 
6000+
> 
2GB 
DDR3 
RAM, 
running 
dual-channel
> 
3 
x 
SATA 
hard 
disks
> 
Emu 
1212m 
sound 
card
> 
Ubuntu 
Studio 
7.10 
(Gutsy, 
I 
think)
> 
> 
Trying 
to 
run 
JACK 
at 
44.1khz, 
at 
a 
128 
sample 
buffer 
I'm 
getting 
on 
the 
> 
order 
of 
50-60 
xruns 
a 
second. 
Even 
at 
a 
4096 
sample 
buffer, 
I 
was 
> 
getting 
one 
xrun 
every 
2 
seconds. 
I 
would 
think 
this 
setup 
should 
be 
> 
able 
to 
handle 
a 
64 
sample 
buffer 
without 
any 
trouble.
> 
> 
The 
one 
caveat 
is 
I 
did 
have 
to 
compile 
the 
latest 
stable 
ALSA 
from 
> 
scratch, 
so 
that 
my 
sound 
card 
would 
work. 
Could 
it 
be 
related 
to 
the 
> 
still-beta 
driver 
for 
my 
Emu 
card? 
Or 
maybe 
I 
need 
to 
recompile 
ALSA 
> 
with 
some 
options?
> 
> 
Thank 
you 
for 
any 
help.

I 
talked 
to 
my 
programming 
prof 
about 
this, 
and 
he 
thinks 
the 
fact 
that 
I'm 
using 
a 
64-bit 
OS 
might 
have 
a 
lot 
to 
do 
with 
it. 
I'll 
try 
installing 
the 
32-bit 
version 
of 
Ubuntu 
Studio 
at 
some 
point 
this 
week 
and 
see 
if 
that 
changes 
anything 
(I 
keep 
all 
of 
my 
data 
on 
a 
separate 
partition, 
so 
it's 
not 
a 
huge 
operation 
for 
me).

-- 
Darren


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