Peter Schachte wrote:
As I understand it, that part will not support cool n quiet operation.
I believe you have to go up to a 3000+ to get that. Cool n quiet,
with the kernel's cqu frequency scaling enabled, slows the clock when
the cpu load is low, saving power and heat, and allowing your cpu fan
to slow down. I've got an Athlon 64 3000+ and have frequency scaling
working very well. The lowest clock speed supported seems to be 1
GHz, though. I wish I could slow it even further for the times when
nothing's happening and the machine is just acting as a file server.
I don't know if it is a well know problem or problem many people have,
but on my AMD64 system with a PVR350 recordings & live-tv show
stutters,audio glitches and mpeg-artifacts if I enable
cpu-frequency-scaling.
I swapped the PVR throug various slots making sure it has its own IRQ.
I also tested playing the mpeg2-stream directly with mplayer via
"mplaver /dev/video0" giving me same audio glitches & artifacts, but no
stutters.
A file recorded through "dd if=/dev/video0 of=/tmp/test.mpg bs=1M
count=20" also has glitches & artifacts.
I had in mind that it might have to deal with freq-scaling, as the only
thing I did was setup the freq-sacling before these issues startet.
If this is not a misconfiguration on my side or a problem based on the
specific hardware combination I use (maybe other AMD64 users can leave
some sentences here), I suggest not to use freq-scaling in combination
with Mythtv.
FWIW, here my system specs:
CPU: AMD Athlon64 3200+
MB: Asus A8N-SLI
RAM: Kingston Value-Ram (2*512MB in dualchannel mode)
GPU: Nvidia Geforce 6600GT PCI-Express
TV: Hauppauge WinTV PVR350
HDDs: 1x 80GB Maxtor IDE containing my System (good for making scrambled
eggs on, if not cooled ;) ), 1x 160GB Samsung containing my /home +
myth-partition for ringbuffer and recordings.
Gentoo Linux running on Kernel 2.6.11-gentoo-r9, baked with genkernel
--menuconfig, modified to include modules only for hardware I have in
the machine + "preemptible kernel" option selected.
ivtv svn version 2889 (had problems with 0.3.9 too)
Jan
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