From: Andres Freund <andres@anarazel.de>
To: pgsql-performance@postgresql.org
Cc: Josh Berkus <josh@agliodbs.com>
Subject: Re: Major Linux performance regression; shouldn't we be worried about RHEL6?
Date: Fri, 5 Nov 2010 21:38:54 +0100
Message-ID: <201011052138.54791.andres@anarazel.de> (raw)
In-Reply-To: <4CD465D8.4070007@agliodbs.com>
References: <4CD465D8.4070007@agliodbs.com>
On Friday 05 November 2010 21:15:20 Josh Berkus wrote:
> All,
>
> Domas (of Facebook/Wikipedia, MySQL geek) pointed me to this report:
>
> http://www.phoronix.com/scan.php?page=article&item=linux_perf_regressions&nI guess thats the O_DSYNC thingy. See the "Defaulting wal_sync_method to
fdatasync on Linux for 9.1?" (performance) and "Revert default wal_sync_method
to fdatasync on Linux 2.6.33+" on hackers.
O_DSYNC got finally properly implemented on linux with 2.6.33 (and thus 2.6.32-
rc1).
> um=1 http://www.phoronix.com/scan.php?page=article&item=ext4_then_now&num=6That one looks pretty uninteresting. Barriers are slower then no barriers. No
surprise there.
Andres
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To: pgsql-performance@postgresql.org
Cc: andres@anarazel.de, josh@agliodbs.com
Subject: Re: Major Linux performance regression; shouldn't we be worried about RHEL6?
In-Reply-To: <201011052138.54791.andres@anarazel.de>
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