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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Stone <mstone+postgres@mathom.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Best way to index IP data?
Date: Fri, 11 Jan 2008 19:19:10 -0500
Message-ID: <28651.1200097150@sss.pgh.pa.us> (raw)
In-Reply-To: <20080111212703.GU5294@mathom.us>
References: <200801101614.54729.kevin@kevinkempterllc.com>
	<DA6DE53A-2F69-46F3-8C96-B341ADCDDFAF@blighty.com>
	<36e682920801101541o7626bbddj428617144240c554@mail.gmail.com>
	<Pine.LNX.4.64.0801111025390.30762@localhost>
	<13179.1200064791@sss.pgh.pa.us>
	<20080111162747.GT5294@mathom.us>
	<24044.1200082058@sss.pgh.pa.us>
	<20080111212703.GU5294@mathom.us>

Michael Stone <mstone+postgres@mathom.us> writes:
> On Fri, Jan 11, 2008 at 03:07:38PM -0500, Tom Lane wrote:
>> Nonsense.  3 bytes overhead on a 16-byte address is not "ridiculously
>> bloated", especially if you want a netmask with it.

> Big if, no? There's a very large set of users that *don't* want/need a 
> netmask, which is why the topic keeps coming back. (Also, according to 
> the docs, inet requires 24 bytes, which is 50% more than needed; is that 
> not correct?)

It was correct, but not as of 8.3.  Considering you could save a whole
one byte by not storing the netmask (well, maybe more depending on
alignment considerations), the complaint level is unjustified.

			regards, tom lane

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