[mythtv-users] Latest SVN pegs my CPU for 720p and 1080i

David Asher david.asher at caviumnetworks.com
Mon Aug 8 23:55:28 UTC 2005

Well, I upgraded my svn 6836 revision to svn HEAD (7004 as of this 
afternoon), and lo-and-behold!  The CPU is actually LESS for 720p 
(45-50% vs ~65%) and 1080i (75% vs 85%) than I was getting with 0.18.1!  

So, I think the problem was one of two things: 1) the database upgrade 
done from 0.18.1 to 6995 left some cruft around, or 2) when I built 
6995, I told it to optimize for my CPU, perhaps that caused a 
performance degradation.

I'll probably rebuild optimized for i686 again and see if it slows down.


David Asher wrote:

> I ended up backing up to 6836 to try the Cuy patches for ATSC 
> scanning.  To be safe I started with a new mysql database.
> I'm now getting the CPU load I expect.  I'll move forward to the 
> latest again soon to see if it was the database causing my performance 
> problems.
> I haven't seen the recording problems you mentioned, but I've only got 
> 1 pcHDTV HD-3000.
> David.
> Blair Preston wrote:
>>I just get a little audio stuttering on my 3.2 prescott, but skipping forward
>>and back seems to fix it.  Latest alsa-1.0.9b stuff.  Seems like some kinda
>>buffer issue but I haven't found a way to fix it yet.
>>The only other wierdness I see is when both pcHDTV HD-3000's are recording at
>>the same time and I'm watching something, after about 20 minutes of recording,
>>my CPU pegs at 80% or so, even when I shutdown viewing, it won't clear.  Th
>>cx88atsc driver reports a buffer overflow at the same time the CPU pegging
>>starts.  This doesn't happen if I'm watching through a remote frontend, only
>>if I'm watching on the master doing the recording.
>>Donavan Stanley (geckofiend at gmail.com) wrote:
>>>On 8/7/05, David Asher <david.asher at caviumnetworks.com> wrote:
>>>>I just switched over from 0.18.1 atrpms mythtv to building from the
>>>>latest svn (changeset 6995, I was hoping to play with the new internal
>>>>dvd player).
>>>>Mythfrontend now pegs my CPU when playing 720p recordings and I get
>>>>frame drops on 1080i recordings.
>>>>I've got a 3Ghz Prescott, and under 0.18.1 720p was ~65% CPU, 1080i ~90%
>>>>CPU -- no frame drops.
>>>>Is anyone else seeing this?  I haven't changed anything else X
>>>I'm using latest SVN with a 2.5ghz Celeron outputing to a 720p display
>>>and have no issues with HD content playback.
>>>mythtv-users mailing list
>>>mythtv-users at mythtv.org
>>mythtv-users mailing list
>>mythtv-users at mythtv.org
>mythtv-users mailing list
>mythtv-users at mythtv.org
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