[CinCV] Warning message question

Hello to everyone, hope you can help me out with this:
Installed Cinelerra from http://cv.cinelerra.org/getting_cinelerra.php#ubuntu
optimised for UbuntuStudio, with OpenGL, by Valentina Messeri:
deb http://giss.tv/~vale/ubuntuopengl/ ./ and for pentium4, by Jure Cuhalev:
deb http://www.kiberpipa.org/~gandalf/ubuntu/feisty/cinelerra/pentium4/ ./
to my laptop wich is a Dell's Latitude D610 with 256 MB in ram and a
centrino processor. I use premiere on my windows partition with no
problems. after installing Cinelerra this message is showing:
void MWindow::init_shm(): WARNING: proc/sys/kernel/shmmax is 0x2000000
which is too low.
Before running cinelerra do the following as root:
echo "0x7 fffffff" >/proc/sys/kernel/shmmax
my question is what does this message means and if I just write that
order and then what? Hope someone can guide me.
Thank you in advance to all for reading this message and for the help
you can provide me.
Have a great day group!!

-- 
Antonio Salgado Leiner.
New Media, Blogger & Podcaster.
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