[mythtv] [PATCH] O_STREAMING patch

[steve at nexusuk.org]

On Tue, 23 Dec 2003, Brian Foddy wrote:

> According to the link, the patch is for 2.4.20-pre9, has it been tested
> with newer kernels?  ie:  2.4.22+ 

I'm running it in 2.4.23 (with lowlatency and preempt patch) with no 
problems.

> They also mention of an improvement
> possible in 2.5, anyone know if this was made in the 2.6 ?  There are some
> other improvements in 2.6 that sound interesting for Mythtv:

I haven't looked into it - I tried the 2.6 kernel a couple of weeks ago 
and the performance of MythTV was pretty abysmal (bttv card, software 
encoding/decoding on an Athlon XP 2000+, running 2.4.23 with lowlatency 
and preempt patches works well, as soon as I put 2.6 on then live TV was 
virtually unwatchable).  So I immediately backed off again to the working 
kernel.

> Improved hyperthreading support.

Do people running MythTV use hyperthreaded processors?  I've never really 
thought about it but it would seem to me that if you're going to spend 
that money then you should probably get a low power system and a PVR card.

> Preempt kernel task for higher priority tasks.

I run the ck preempt and lowlatency patches for the 2.4 kernel and there 
is a marked improvement over unpatched 2.4.  I believe the 2.6 preempt 
stuff works in a different way to the ck patches, but I don't know the 
specifics of it.

> Drawback:  Nvidia drivers may not work.

I've had the Nvidia drivers working on the 2.6.0-test3 kernel at work for 
months with no problem - there is a patch somewhere to apply to the stock 
closed-source drivers.

-- 

 - Steve                                             http://www.nexusuk.org/

     Servatis a periculum, servatis a maleficum - Whisper, Evanescence