[mythtv-users] Performance issue
Matt Vollmar
matt at vollmars.com
Fri Oct 8 12:50:15 UTC 2004
Hi Mythical World,
First of all, I add my thanks to the long list that has already
accumulated. I'm sure we will soon have to start a mailing list just
for thanks soon.
I just built a new box:
- Shuttle SS51G V.2.0
- Celeron 2.4 GHz
- 512 MB PC2700 DDR RAM
- Western Digital 120 GB HD (8MB Cache, 7200 RPM)
- PNY NVidia MX440 64MB DDR AGP (6111 Drivers)
- ATI TV Wonder PCI
- External DVD Writer via USB (for boot) or IEEE1394
- Mandrake 10.0 upgraded to Cooker (so basically 10.1)
- MythTv with all plugins from the site - CVS version
-- Alsa AND OSS compiled in because I wasn't sure if that was my prob
-- XvMC compiled in because I have the MX440
Rules the Universe except for one thing: I cannot watch Live TV without
the infamous "prebuffering pause". I've tried a bunch of different
configs with the way it captures, the way it decodes, etc. I even
started to wonder if it was btaudio, since I use that to capture the
audio. I started to watch the system when I was capturing movies, and
it runs at about 70-80% (I use higher quality for these) and watching at
about 30%. I have captured a little bit of sar to prove my point:
Watching a Recording
08:05:34 PM CPU %user %nice %system %iowait %idle
08:06:04 PM all 30.14 0.00 5.79 0.00 64.07
Recording a Show
08:09:06 PM CPU %user %nice %system %iowait %idle
08:09:11 PM all 81.11 0.00 1.99 0.20 16.70
08:09:16 PM all 84.57 0.00 1.20 0.00 14.23
08:09:21 PM all 77.45 0.00 1.40 0.20 20.96
The recording seems to be the problem. Here are my settings:
TV Playback:
- Deinterlace with Bob (2x) -- I figure since I have XvMC compiled in
(kernel makes no difference)
- Use XvMC Hardware Decoding
Software Encoders -> Live TV
- 480x480 (I would really like 640)
- MPEG-4, bitrate=3000, max qual=2, min qual=15, max diff=3, the rest is
UNCHECKED
- MP3, 32000, Quality=7
If you need more info, let me know. This is all the info I know to
check for.
Thanks in advance.
Matt
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