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 <E25A9AD2-EAD3-4372-AFD2-2627E4D5E3C5@percona.com> <x56pxq6jpuftn6ear3uwbz5tyb4r37itv5zetvcucq3td57apc@yq7jyka7tszv>
In-Reply-To: <x56pxq6jpuftn6ear3uwbz5tyb4r37itv5zetvcucq3td57apc@yq7jyka7tszv>
From: Andrew Pogrebnoi <andrew.pogrebnoi@percona.com>
Date: Tue, 17 Feb 2026 22:06:14 +0200
Message-ID: <CA+aWR11Gvz4RvPaBx1kfpTx2QxpNW46Yv120dDcUA93UbYcxrg@mail.gmail.com>
Subject: Re: Lowering the default wal_blocksize to 4K
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@postgresql.org, Heikki Linnakangas <hlinnaka@iki.fi>, 
	Robert Haas <robertmhaas@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, 
	Matthias van de Meent <boekewurm+postgres@gmail.com>
Content-Type: multipart/mixed; boundary="0000000000002913ae064b0a9bdd"
Archived-At: <https://www.postgresql.org/message-id/CA%2BaWR11Gvz4RvPaBx1kfpTx2QxpNW46Yv120dDcUA93UbYcxrg%40mail.gmail.com>
Precedence: bulk

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Hi,

On Mon, Feb 16, 2026 at 11:13=E2=80=AFPM Andres Freund <andres@anarazel.de>=
 wrote:
> Hi,
>
> On 2026-02-16 10:04:37 +0200, Andy Pogrebnoi wrote:
> > Since we recycle WAL segments, the added size won't go to the disk
usage but
> > rather cause a bit more freqent segment.
>
> I don't think that's a valid argument though, how much WAL needs to be
> archived is a relevant factor.

Yes, indeed.


> If NBuffers / 32 < wal_segment_size / XLOG_BLCKSZ, the chosen xbuffers
value
> does not depend on XLOG_BLCKSZ.
>
> To me the code only makes sense if you assume that NBuffers / 32 gives
you a
> value in the same domain as data blocks, otherwise NBuffers / 32 is not
the
> approximation of %3 that the comment talks about.
>
>
> I think the code just needs to be fixed to multiply NBuffers * BLCKSZ and
then
> divide that by XLOG_BLCKSZ.

You are right, my bad, fixed (v2-0002).


> I think the auto-tuning bit above needs to be fixed, and it's probably
worth
> manually testing a pg_upgrade from 8kB XLOG_BLCKSZ to 4kB. It should
work, but

pg_upgrade ran with no issues, and the database started with the new (4kB)
XLOG_BLCKSZ


I also found and fixed some more mentions of 8kB as the default for
XLOG_BLCKSZ in the
documentation (v2-0001).

---
Cheers,
Andy

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<div dir=3D"ltr"><div>Hi,</div><br><div class=3D"gmail_quote gmail_quote_co=
ntainer"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Feb 16, 2026 at 11:1=
3=E2=80=AFPM Andres Freund &lt;<a href=3D"mailto:andres@anarazel.de">andres=
@anarazel.de</a>&gt; wrote:<br>&gt; Hi,<br>&gt; <br>&gt; On 2026-02-16 10:0=
4:37 +0200, Andy Pogrebnoi wrote:<br>&gt; &gt; Since we recycle WAL segment=
s, the added size won&#39;t go to the disk usage but<br>&gt; &gt; rather ca=
use a bit more freqent segment.<br>&gt; <br>&gt; I don&#39;t think that&#39=
;s a valid argument though, how much WAL needs to be<br>&gt; archived is a =
relevant factor. <br>=C2=A0<br>Yes, indeed.<br><br>=C2=A0<br>&gt; If NBuffe=
rs / 32 &lt; wal_segment_size / XLOG_BLCKSZ, the chosen xbuffers value<br>&=
gt; does not depend on XLOG_BLCKSZ.<br>&gt; <br>&gt; To me the code only ma=
kes sense if you assume that NBuffers / 32 gives you a<br>&gt; value in the=
 same domain as data blocks, otherwise NBuffers / 32 is not the<br>&gt; app=
roximation of %3 that the comment talks about.<br>&gt; <br>&gt; <br>&gt; I =
think the code just needs to be fixed to multiply NBuffers * BLCKSZ and the=
n<br>&gt; divide that by XLOG_BLCKSZ.<br>=C2=A0<br>You are right, my bad, f=
ixed (v2-0002). <br><br>=C2=A0<br>&gt; I think the auto-tuning bit above ne=
eds to be fixed, and it&#39;s probably worth<br>&gt; manually testing a pg_=
upgrade from 8kB XLOG_BLCKSZ to 4kB. It should work, but<br>=C2=A0<br>pg_up=
grade ran with no issues, and the database started with the new (4kB) XLOG_=
BLCKSZ<br><br><br>I also found and fixed some more mentions of 8kB as the d=
efault for XLOG_BLCKSZ in the <br>documentation (v2-0001).<br><br>---<br>Ch=
eers,<br>Andy<br></div></div></div>

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