Re: Re: Misaligned BufferDescriptors causing major performance problems on AMD

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Peter Geoghegan <pg(at)heroku(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Re: Misaligned BufferDescriptors causing major performance problems on AMD
Date: 2014-02-05 14:57:11
Message-ID: 17065.1391612231@sss.pgh.pa.us
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Andres Freund <andres(at)2ndquadrant(dot)com> writes:
> On 2014-02-04 16:24:02 -0800, Peter Geoghegan wrote:
>> I suspect that the scenario described in this article accounts for the
>> quite noticeable effect reported: http://danluu.com/3c-conflict

> I don't think that's applicable here.

Maybe, or maybe not, but I think it does say that we should be very wary
of proposals to force data structure alignment without any testing of the
consequences.

regards, tom lane

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