[mythtv-users] [mythtv] Video lags behind audio

[Michael T. Dean]

On 07/18/2006 11:10 PM, En Ming Teo wrote:

> Finally, I looked at Machine Status. It tells me I have only about 20+ 
> MB of Physical RAM left. Looks like I have to add more ram to my computer.


Probably not important.  Linux kernels use available RAM as a 
buffer/cache for data being read or written to external devices (network 
interfaces, disks, etc.), so you're very unlikely to have lots of 
Physical RAM left...  After all, unused RAM is a waste of money.


 From my Myth box:

$ free
             total       used       free     shared    buffers     cached
Mem:        515964     508432       7532          0      40192     272244
-/+ buffers/cache:     195996     319968
Swap:       506036     287740     218296

Says that over 500MiB of 512MiB were used leaving about 7MiB free.  
However, of that memory, ~40MiB is used for buffers and ~270MiB is used 
for cache.  Since buffers and cache can be cleared without paging, that 
means that I have over 300MiB that's truly free (as shown on the second 
line of output) and only about 190MiB of RAM in use by applications).

Oh, as for the swap line, I have set a relatively aggressive swappiness 
on my box because if I ain't using the app, why waste memory on it...

Mike