[vdr] Re: Buffer overflows

[Jan Ekholm <chakie@infa.abo.fi>]

On Thu, 25 Sep 2003, Sascha Volkenandt wrote:

>At Donnerstag, 25. September 2003 22:14 Jan Ekholm wrote:
>> Anyone know if increasing the various buffers within VDR is enough to get
>> rid of the buffer overflows? Is it a true solution or just band aid?
>> There was a mail a while ago that mentioned values that could be used and
>> where, but I've not tried that yet. But tonight I missed a South Park
>> episode due to an overflow, so I could give the idea a shot. :)
>
>Usually a buffer overflow only occurs if, and only if a receiver cannot
>process any more data (i.e. recorder: the disk can't accept data, network:
>the client doesn't read data fast enough, ...). So only buffer overflows in
>the recorder are fatal (in your case).

Weird. It did happen about a minute after a recording started, but we've
had no problems with disk performance so far. We've successfully recorded
three shows at the same time while watching one of the shows. The disk is
a pretty new disk with DMA and decent performance, so I don't know what
could cause it to get too busy. The logs show no other activity and cron
doesn't run at the same time either. If the disk is temporarily busy one
would think that it would catch up after a few seconds, especially as the
data is stored in a ring buffer with a max size.

The received TV material also seemed to be ok, I restarted VDR and had a
look at what came down the cable. We have cable and not terrestrial or
satellite, so weather should not affect transmissions. Although the local
cable company isn't always that clueful so they may have had something
fubar.

I did increase the buffers as suggested in this thread, we'll see if the
problem still occurs, but if the default buffer of 5M could get filled I
see no reason why 8M wouldn't get filled just as well?

--
   Crowley was in Hell's bad books. Not that Hell has any other kind.
                           -- Terry Pratchett & Neil Gaiman, Good Omens



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