shared memory problem

HI all!

I did this:

/usr/local/pgsql/bin/postmaster -B 1000 -o "-S 2000" -S -D
/usr/local/pgsql/data

and it says:
IpcMemoryCreate: shmget failed (Invalid argument) key=5432001,
size=8899584,permission=600
This type of erro is usually caused by an improper shared memory or System V
IPC semaphore configuration. Form more information....

what should I do, I am running a 600Mhz Celeron with 512RAM, I have tried the
same command in others machines and works fine,
thank you for your help,
Rocael.

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