From: Greg Smith <greg@2ndquadrant.com>
To: Marti Raudsepp <marti@juffo.org>
Cc: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@postgresql.org
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
Date: Fri, 05 Nov 2010 15:06:05 -0700
Message-ID: <4CD47FCD.6010106@2ndquadrant.com> (raw)
In-Reply-To: <AANLkTinEAmKDz7x356bgX=-6x7zpjK3bB0hYAmKvYHB9@mail.gmail.com>
References: <AANLkTi=n3zxiLNFhbpiN=JPQPwB=BhXf9iepw1KOEs8U@mail.gmail.com>
<4CCDCAA3.4050805@2ndquadrant.com>
<201011010010.28724.andres@anarazel.de>
<4CD472CC.80006@2ndquadrant.com>
<AANLkTinEAmKDz7x356bgX=-6x7zpjK3bB0hYAmKvYHB9@mail.gmail.com>
Marti Raudsepp wrote:
> In fact, I was wrong in my earlier post. Linux always offered O_DSYNC
> behavior. What's new is POSIX-compliant O_SYNC, and the fact that
> these flags are now distinguished.
>
While I appreciate that you're trying to help here, I'm unconvinced
you've correctly diagnosed a couple of components to what's going on
here properly yet. Please refrain from making changes to popular
documents like the tuning guide on the wiki based on speculation about
what's happening. There's definitely at least one mistake in what you
wrote there, and I just reverted the whole set of changes you made
accordingly until this is sorted out better.
--
Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD
PostgreSQL Training, Services and Support www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books
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To: pgsql-performance@postgresql.org
Cc: greg@2ndquadrant.com, marti@juffo.org, andres@anarazel.de
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
In-Reply-To: <4CD47FCD.6010106@2ndquadrant.com>
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