weired message

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi all, 

when I start cinelerra, I always get the following message:

-----------
void MWindow::init_shm(): Warning: /proc/sys/kernel/shmmax is 0x7ffffff, which 
is too low.
Before running Cinelerra do the following as root:
echo "0x7fffffff" > /proc/sys/kernel/shmmax
-----------------------

So far so well, but "/proc/sys/kernel/shmmax" is not existent.
What is this command for? I guess it allocates more ram.

How can I fix it ? And what is the background of this ?

Any help is welcome.


Regards

Hans