Comment 33 for bug 264336

Now (probably after upgrading to kernel 2.6.28-14) postgres will no longer start, not even when I try to start it manually with sudo /etc/init.d/postgresql-8.3 start, it complains with

2009-08-06 10:55:59 CEST FATAL: could not create shared memory segment: Invalid argument
2009-08-06 10:55:59 CEST DETAIL: Failed system call was shmget(key=5432001, size=39288832, 03600).
2009-08-06 10:55:59 CEST HINT: This error usually means that PostgreSQL's request for a shared memory segment exceeded your kernel's SHMMAX parameter. You can either reduce the request size or reconfigure the kernel with larger SHMMAX. To reduce the request size (currently 39288832 bytes), reduce PostgreSQL's shared_buffers parameter (currently 4096) and/or its max_connections parameter (currently 103).
        If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which case raising the request size or reconfiguring SHMMIN is called for.
        The PostgreSQL documentation contains more information about shared memory configuration.