kernel.shmmax: avast: can not initialize avast! engine: Invalid argument

Today I got this error message
“avast: can not initialize avast! engine: Invalid argument”
again.

I know that this comes from a kernel.shmmax that is too low.
Is there some information page from Avast, which tells us which minimum kernel.shmmax to use?

Thanks
BR

See: http://forum.avast.com/index.php?topic=148271.0