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Re: FreeBSD page size (was Re: The results of my

From: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
To: Vivek Khera <khera(at)kcilink(dot)com>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: FreeBSD page size (was Re: The results of my
Date: 2003-09-04 21:56:22
Message-ID: Pine.LNX.4.33.0309041556060.28693-100000@css120.ihs.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, 3 Sep 2003, Vivek Khera wrote:

> >>>>> "SC" == Sean Chittenden <sean(at)chittenden(dot)org> writes:
> 
> >> I need to step in and do 2 things:
> SC> Thanks for posting that.  Let me know if you have any questions while
> SC> doing your testing.  I've found that using 16K blocks on FreeBSD
> SC> results in about an 8% speedup in writes to the database, fwiw.
> 
> Just double checking: if I do this, then I need to halve the
> parameters in postgresql.conf that involve buffers, specifically,
> max_fsm_pages and shared_buffers.  I think max_fsm_pages should be
> adjusted since the number of pages in the system overall has been
> halved.
> 
> Anything else that should be re-tuned for this?

Yes, effective_cache_size as well is measured in pgsql blocks.


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