InnoDB or OS restriction?

[alex]

Hi people,

I have mysql 4.0.7-gamma/linuxthreads running under FreeBSD 4.6.2 (server
has 4G phisical memory), and occasionally mysql traps with the message:

InnoDB: Fatal error: cannot allocate 1064960 bytes of
InnoDB: memory with malloc! Total allocated memory
InnoDB: by InnoDB 513951016 bytes. Operating system errno: 12
InnoDB: Cannot continue operation!

The first strange thing is that MAXDSIZ and DFLDSIZ in kernel config are
setted to 1536M, and the second one is that each time it happens, while
the number of bytes reported to cannot be allocated is different, total
memory allocated by InnoDB is exactly the same - 513951016 bytes. Which
restrictions are the cause of this - InnoDB's or FreeBSD's?

Thanks in advance

----
Alex