[mythtv-users] .20 needing more CPU than .19? (My upgrade story)

H P Ladds householdwords at gmail.com
Thu Sep 28 20:30:23 UTC 2006

Short answer: yes, I'm seeing high CPU usage.

Long answer: I'm not certain .20 is to blame.  I noticed considerably
reduced performance after switching from a Knoppmyth to FC 5 install on a
AMD 64 3500+. nVidia FX 5200, pcHDTV hd3000, 1 gig ram machine. The last
time I used the Knoppmyth setup was to watch the finals of the US Open
Tennis with OTA High Def. It worked beautifully.

Since then I when to FC 5 / MythTV .20 and have trouble bringing in regular
SD with out stutter and freeze. CPU is commonly above 85%.

On 9/12/06, Justin The Cynical < cynical at penguinness.org> wrote:
> Current frontend/backend machine:
> Matsonic MS9337C Pentium 4 2.26GHz, socket 478
> 512 Meg PC3300
> MSI Nvidia 6200 AGP (running at 4x), NVidia driver 8774
> SB Live 5.1
> LFS based, Kernel
> Tuners: Avermedia M179 and a PCHD3000
> Back Story:
> I had the machine in a generic tower case, until the wife told me to get
> a Silverstone case we saw at Fry's (I was going to repaint and modify an
> old gateway desktop case originally, but hey, I'm not going to argue
> with her when she tells me to buy new kit).
> When I moved the hardware over to the LC17, I found that the case didn't
> leave much room for cables.  I managed to cram them all in, but the IDE
> ribbon is not very smooth and the power wires run in the same area.  I'm
> not happy about this and I've not had a chance to reroute everything.
> I was using a celeron 2 gig CPU at the time.
> At this time, the digital signal for KPTV (121 in the Portland Oregon
> metro area) started receiving "WriteAudio: buffer underrun"...  a lot of
> them, making livetv and recordings from that channel unwatchable (I
> didn't have any previous recordings, pre-move case change, to compare it
> to).
> So, I picked up the newer Pentium 4.  KPTV started playing back
> normally, and the system as a whole started running much smoother
> (imagine that).
> Enter Myth .20
> Pulling the code from the release-0-20-fixes (rev 11157), I compiled and
> installed.  While the system as a whole has some great improvements and
> additions, KPTV started getting the audio underruns again.
> During my experimentation with this, I tried turning off deinterlacing,
> and the underruns were reduced by a noticeable amount.  And since
> deinterlacing takes CPU, it would seem that the .20 rev needs more CPU.
> Also, the themes seem to be missing menus (going into the brows view for
> mythvideo using GNAT crashed X as before), but that's something I can
> fix later.
> So, those of you who are running .20, are you noticing higher load and
> CPU usage, or am I running into another issue and just don't know it?
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