[mythtv-users] Performance issue
Matt Vollmar
matt at vollmars.com
Sun Oct 10 00:53:50 UTC 2004
I just realized that maybe I didn't state my question. :-) Is this
performance normal? I saw other people saying that there should be no
problem recording and watching a recording at the same time with this
type of system (or doing more). Please help! I bought this system so
that I could record and watch at the same time.
Thanks,
Matt
Matt Vollmar wrote:
> 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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