Re: Re[2]: [HACKERS] Re: [PATCHES] A patch for xlog.c

[Bruce Momjian]

> > the only problem is because if we need to tune Postermaster to use
> > large buffer while system havn't so many SYSV shared memory, in many
> > systemes, we need to recompile OS kernel, this is a small problem to install
> > PGSQL to product environment.
> 
> What?  You don't automatically recompile your OS kernel when you build a
> system in the first place??  First step on any OS install of FreeBSD is to
> rid myself of the 'extras' that are in the generic kernel, and enable
> SharedMemory (even if I'm not using PgSQL on that machine) ...

He is saying the machine is already in production.  Suppose he has run
PostgreSQL for a few months, then needs to increase number of buffers. 
He can't exceed the kernel limit unless he recompiles.

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