[mythtv] waiting for prebuffer...

[Robert Rozman]

Hi,

sorry for dummy question: what is MTU and how to set its value ?

Regards,

Robert.

----- Original Message ----- 
From: "John Patrick Poet" <john at BlueSkyTours.com>
To: "Development of mythtv" <mythtv-dev at mythtv.org>
Sent: Monday, September 27, 2004 10:35 PM
Subject: Re: [mythtv] waiting for prebuffer...



On Mon, 27 Sep 2004, Thomas Börkel wrote:

> HI!
>
> John Patrick Poet wrote:
>
> >> Does it help at all if you uncomment the calls to run the decoder at
> >> realtime priority?  (This is not a good idea in general -- sometimes
> >> makes the videoout thread starved for cycles and jittery -- but if it
> >> improves matters might indicate that the decoder thread's starved for
> >> CPU).  Could the driver for your gigabit ethernet be hogging CPU for
> >> longish periods?  Can you try to make the MTU smaller?
> >
> > The typical load on the frontend is just a touch over 1, with between 40
> > and 45% CPU.
> >
> > I have had this problem since before you added the "realtime priority",
> > so I don't think that has anything to do with it.
> >
> > I need to some more testing, but it actually looks like lowering the MTU
> > has solved the problem!  The problem is infrequent enough that I cannot
> > be sure, but I have not seen a glitch in over an hour, now.
>
> To what value did you set the MTU? And did you lower it only on the
> frontend?
>
> Thomas
>

Actually, I only lowered on on the backend.  I just randomly choose 800, and
it does seem to have fixed the problem.

I use my backend for other things, several of them internet related, so I
assume that even though it has a gigabit NIC, that service times were too
long.

John

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