[mythtv] [PATCH] O_STREAMING patch
bfoddy at visi.com
Tue Dec 23 12:36:08 EST 2003
On Mon, 22 Dec 2003, Isaac Richards wrote:
> On Monday 22 December 2003 01:07 pm, steve at nexusuk.org wrote:
> > This patch sets the O_STREAMING flag when the ring buffer is opened to
> > instruct the kernel not to cache the data once it's been accessed. The
> > result is a much more responsive frontend after watching TV since most of
> > the frontend's files haven't been expired from the kernel's pagecache.
> > You also need the O_STREAMING kernel patch:
> > http://kerneltrap.org/node/view/460
> I dunno, defining the O_STREAMING in the source seems rather dangerous to me.
> Potential clashes with things other than linux, etc.. Can't check for it
> with an ifdef?
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 all in favor of the concept however.
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:
Improved hyperthreading support.
Preempt kernel task for higher priority tasks.
Alsa and V4L2 included (already included in Mandrake).
There is a new system call (forget the name) that is optimized
for reading data from HD and sending over network which might be
helpful to the backend.
Drawback: Nvidia drivers may not work.
I might try an experiment on it in the coming weeks.
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