[vdr] Re: Recordings menu sluggish - *the* solution.

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

Carsten Koch wrote:
> 
> Andreas Trauer wrote:
> ...
> > I don't believe this will work so easily. As said in the man page: "In
> > general this will degrade performance"
> 
> I believe that seeing is believing. ;-)
> 
> In other words: we can speculate a lot about it, but no matter what
> the result of our speculation is, the reality may be different.
> 
> IMHO, the best (and most practical) approach would be to try it out.
> 
> Klaus, am I right in believing that we can easily test this by
> simply making the buffer sizes a multiple of 4k (which I assume
> they already are) and setting the O_DIRECT flag for the read and
> write open calls for the nnn.vdr files?

You may also have to make sure that the buffer starts at a 4K
boundary.

> Of course, fast forward/backward and jump may not necessarily
> work with that trivial mod, but linear recording and playback
> would be more than enough to get a feeling whether O_DIRECT is
> good or bad for vdr, solves the "Recordings menu sluggish" problem
> and increases overall system performance by leaving the cache
> available for useful data.

From what I've seen in the link Michael Hoffmann has posted
(http://kerneltrap.org/node/view/460) I'd say that sounds
a lot more promising...

Klaus


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