[vdr] Re: VDR eating CPU time

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Achim Lange wrote:
> 
> Hello Tilo,
> 
> > First of all, thanx for your quick answer, but I am not one of
> > those incredible coders out there. I am only one of the lucky
> > guys, that know about VDR, and uses it with pleasure.
> >
> > Could you please tell me a little more detailed what I have to to
> > exactly ??
> > > -----Original Message-----
> > > From: kls@cadsoft.de [mailto:kls@cadsoft.de]On Behalf Of Klaus
> > > Schmidinger
> > > Sent: Sunday, January 13, 2002 11:29 AM
> > > To: vdr@linuxtv.org
> > > Subject: [vdr] Re: VDR eating CPU time
> > >
> > >
> > > You could try to increase the value in the usleep(1) call in
> > > cTransferBuffer::Output(). Try it with 10, 100, 1000, 10000
> > > and check whether the system load goes down and the transfer mode
> > > still works without glitches.
> > >
> > > Klaus
> 
> go to your VDR-Source directory (e.g. /usr/src/VDR)
> do "grep TransferBuffer *.c" (if that would not have helped, you could have
> tried the search in *.h also)
> there you get only the file dvbapi.c
> Open this file in vi (or the editor of your choice) and search for
> "cTransferBuffer::Output"
> 
> Around the line 2240 (depending on which patches you have applied) you will
> find a function-declaration of this name.
> about 8 lines lower you find something like:
> 
> if (Available() < MAXFRAMESIZE) {
>               usleep(100000); // allow the buffer to collect some reserve
>               continue;
>               }
> and I guess that value 100000 is the one, that Klaus meant. Change it, and
> do your "make" again (with all the parameters you used originally).

No, that's not the one. Look 23 lines further down:

            usleep(1); // this keeps the CPU load low

That's the one!

Klaus


> 
> Hope this helps,
> 
> ciao,
> 
>     Achim (who does not have a clue of programming in C or C++ either, but
> usually knows where to look :)

-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
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