linux-kernel - Re: [Lsf] Postgresql performance problems with IO latency, especially during fsync()

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Message-ID: <20140428235714.GA16070@awork2.anarazel.de>
Date:	Tue, 29 Apr 2014 01:57:14 +0200
From:	Andres Freund <andres@...razel.de>
To:	Dave Chinner <david@...morbit.com>
Cc:	rhaas@...razel.de, linux-kernel@...r.kernel.org,
	lsf@...ts.linux-foundation.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [Lsf] Postgresql performance problems with IO latency,
 especially during fsync()

Hi Dave,

On 2014-04-29 09:47:56 +1000, Dave Chinner wrote:
> ping?

I'd replied at http://marc.info/?l=linux-mm&m=139730910307321&w=2

As an additional note:

> On Wed, Apr 09, 2014 at 07:20:09PM +1000, Dave Chinner wrote:
> > I'm not sure how you were generating the behaviour you reported, but
> > the test program as it stands does not appear to be causing any
> > problems at all on the sort of storage I'd expect large databases to
> > be hosted on....

A really really large number of database aren't stored on big enterprise
rigs...

Andres Freund

-- 
 Andres Freund	                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services
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