InnoDB can't allocate memory (1 reply)

Hello everybody

Last time I tried to restart mysql, I got this error

110203 12:23:26 InnoDB: Error: cannot allocate 10737434624 bytes of
InnoDB: memory with malloc! Total allocated memory
InnoDB: by InnoDB 48401248 bytes. Operating system errno: 12
InnoDB: Check if you should increase the swap file or
InnoDB: ulimits of your operating system.
InnoDB: On FreeBSD check you have compiled the OS with
InnoDB: a big enough maximum process size.
InnoDB: Note that in most 32-bit computers the process
InnoDB: memory space is limited to 2 GB or 4 GB.
InnoDB: We keep retrying the allocation for 60 seconds...

It seems that innodb_pool_size can't be any more 10G as it was.
I have 16 GB Ram and a 64 bit Gentoo Linux, so I can't understand what's the matter, and why it worked up to now