[mythtv-users] Strange backend activity

Adam Biskobing tv at badmoon.com
Mon Mar 1 15:02:05 EST 2004


I'm using a PVR-250 card, it's easy on the CPU.

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of 
> gkanis at cems.umn.edu
> Sent: Monday, March 01, 2004 1:21 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Strange backend activity
> 
> 
> For my system (P4 2.4), mythbackened takes about 60% of the 
> CPU during 
> recording,
> 
> 
> On Monday 01 March 2004 12:08 pm, Adam Biskobing wrote:
> > A little bit more information, I've been watching my backend today 
> > trying to see when and where it starts eating up the CPU.  
> I scheduled 
> > a recording at 11:30, it was running fine eating up 2% of the cpu, 
> > until the end of the recording, where a mythbackend process with a 
> > nice level of 19 started to eat up 49-50% of the CPU, memory usage 
> > appears to be static.  Is this normal?  Any idea what this 
> process is 
> > doing?  I've scheduled another recording to begin at 12:30 
> to see what 
> > happens when it tries to do that recording.
> >
> > > -----Original Message-----
> > > From: mythtv-users-bounces at mythtv.org 
> > > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of jose rubio
> > > Sent: Saturday, February 28, 2004 5:54 PM
> > > To: Discussion about mythtv
> > > Subject: Re: [mythtv-users] Strange backend activity
> > >
> > > On Sat, 2004-02-28 at 04:33, Adam Biskobing wrote:
> > > > Chaintech Motherboard
> > > > Athlon XP 2000 Processor
> > > > 256MB Memory
> > > > 80GB & 120GB IDE Discs
> > > > PVR-250
> > > > Gentoo Linux
> > > > Running CVS as of last week
> > > >
> > > > The problem started with version .13, continued into .14
> > >
> > > and also into
> > >
> > > > the CVS.  As I came down this morning, I notice that it 
> had done 
> > > > it again, The only entries in the backend log were:
> > > >
> > > > 2004-02-28 08:45:02 Started recording "The Sting" on
> > >
> > > channel: 1526 on
> > >
> > > > cardid: 1,
> > > >  sourceid 1
> > > > 2004-02-28 08:45:02 External channel change: 
> > > > /usr/share/mythtv/channel/rca.pl 52 6 & 2004-02-28 08:45:02 
> > > > Changing from None to RecordingOnly 2004-02-28 08:45:02 Using 
> > > > profile 'Default' to record Starting up as the master server.
> > > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 0
> > > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 1
> > > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 2
> > > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 3
> > > >
> > > > Any help would be greatly appreciated.  I'm out of ideas,
> > >
> > > and this is
> > >
> > > > really cutting into the usability of myth.
> > >
> > > OK, just a shot in the dark here.  I'm assuming you are 
> running ivtv 
> > > 0.1.9...  But I don't think it's an ivtv problem if it is the 
> > > backend running up the cpu.
> > >
> > > Looking at your log, I'm curious why you get the msg 
> "Starting up as 
> > > the master server" in the middle of the log when it 
> should be at the 
> > > begining.  Unless you restarted the server between 8:45 and 9:17. 
> > > (did
> > > you?)
> > >
> > > If not I do not see why myth would be probing for input in the 
> > > middle of recording.
> > >
> > > I did a grep -r "Probed" * in the myth source tree to see 
> where that 
> > > msg was coming from (I have never gotten that in my 
> logs).  It seems 
> > > to be only when using v4l2.  Do you have your kernel patched with 
> > > v4l2 or did you just use the header in the ivtv/utils directory?
> > >
> > > This could be the diff, I am _not_ using v4l2, just the header...
> > >
> > > Anyway, if you did not restart the backend at about 9:00 then try 
> > > compiling a new kernel without v4l2... I told you it was 
> a shot in 
> > > the dark...
> > >
> > >
> > > Well I hope I was of some help.
> > >
> > >
> > >
> > > -jose-
> 
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