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Kubuntu 7.04 “Feisty Fawn” Herd 1: realtime test drive! December 8, 2006

Posted by oktyabr in audio, kde, linux, realtime, ubuntu.
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So what’s this sexy new *buntu have under the hood?

More importantly (at least to me!) is it any good for multimedia?

overlord@biggun2:~$ ./infobash -v2
Host/Kernel/OS “biggun2” running Linux 2.6.19-7-generic i686 [ Ubuntu feisty (development branch) ]
CPU Info AMD Athlon 64 3500+ clocked at [ 2211.357 MHz ]
Videocard nVidia G70 [GeForce 7800 GT] X.Org 7.1.1 [ 2560×1024 @100hz ]
Network cards nVidia CK804 Ethernet Controller, at port: b000
Processes 110 | Uptime 1day | Memory 1852.15/2027.19MB | HDD ST380013A Size 80GB (3%used) | GLX Renderer GeForce 7800 GT/PCI/SSE2/3DNOW! | GLX Version 2.1.0 NVIDIA 96.29 | Client Shell | Infobash v2.51

Works suprising well too, out of the box!

14:42:30.330 JACK is starting…
14:42:30.330 /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p128 -n2 -S
14:42:30.349 JACK was started with PID=23775 (0x5cdf).
jackd 0.101.1
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK compiled with System V SHM support.
loading driver ..
apparent rate = 44100
creating alsa driver … hw:0|hw:0|128|2|44100|0|0|nomon|swmeter|-|16bit
control device hw:0
configuring for 44100Hz, period = 128 frames, buffer = 2 periods
nperiods = 2 for capture
nperiods = 2 for playback

This is giving me a DSP load of 1.2% in Audacity and a latency of only 5.8ms running on an on-board sound chip (nforce4 AC97 Realtek ALC850). I recorded a single 16bit 48000 Hz sample of Hydrogen playing and another one of the Audacious media player via it’s Jack plugin at the same time with ZERO xruns.

The only xruns I’ve had is when my opengl screensaver kicked in during a break for food 😉

overlord@biggun2:/boot$ cat config*|grep PREEMPT
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_BKL=y
overlord@biggun2:/boot$ cat config*|grep HZ
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250
CONFIG_MACHZ_WDT=m

So it looks like it could obviously use some improvement but still quite impressive for a “generic” kernel!

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