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From: Josh Berkus <josh@agliodbs.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Linux memory zone reclaim
Date: Fri, 03 Aug 2012 16:15:33 -0700
Message-ID: <501C5B95.90400@agliodbs.com> (raw)
In-Reply-To: <CAOR=d=1zKvEObk4ifjvLRamX920YQ6AzdkM2X2SEzgmzFq=kRw@mail.gmail.com>
References: <500616CB.3070408@2ndQuadrant.com>
	<501673680200002500049227@gw.wicourts.gov>
	<CAOR=d=2R5VKL2nEff3KpTWrLoZStyfOnAOwfeNC3b67ecSFJnw@mail.gmail.com>
	<501C50FE.80905@agliodbs.com>
	<CAOR=d=1zKvEObk4ifjvLRamX920YQ6AzdkM2X2SEzgmzFq=kRw@mail.gmail.com>


>> This is poor design on Linux's part, since even the distant RAM is
>> faster than disk.  For now, we've been disabling zone_reclaim entirely.
> 
> I haven't run into this, but we were running ubuntu 10.04 LTS.  What
> kernel were you running when this happened?  I'd love to see a test
> case on this, as it seems like a major regression if it's on newer
> kernels, and we're looking at running 12.04 LTS soon on one of our
> bigger machines.

Jeff Frost will have a blog up about it later; we're still collecting data.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com



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