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Hermes SMTP Server) with ESMTPA ID 09bfb9a6e8fab4c55f72e15a5311dc9a; Tue, 11 Nov 2025 17:22:56 +0000 (UTC) Content-Type: text/plain; charset=utf-8 List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3826.700.81\)) Subject: Re: kernel: warning: total configured swap (493567 pages) exceeds maximum recommended amount From: Mark Millard In-Reply-To: <86qzu4vazw.fsf@ltc.des.dev> Date: Tue, 11 Nov 2025 09:22:45 -0800 Cc: freebsd-current@freebsd.org, freebsd-arm@freebsd.org, bob prohaska Content-Transfer-Encoding: quoted-printable Message-Id: <59321C66-9B02-448D-A275-500857BEF641@yahoo.com> References: <86qzu4vazw.fsf@ltc.des.dev> To: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= X-Mailer: Apple Mail (2.3826.700.81) X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Queue-Id: 4d5YJm4Kp2z3pKr On Nov 11, 2025, at 07:34, Dag-Erling Sm=C3=B8rgrav = wrote: > void writes: >> On a newly installed >> = FreeBSD-16.0-CURRENT-arm-armv7-GENERICSD-20251103-088ced14a69b-281661.img >>=20 >> unmodified settings 32GB mmcsd. >>=20 >> fstab entry for swap is: >>=20 >> /dev/label/growfs_swap none swap sw 0 = 0 >>=20 >> swap in top shows: >>=20 >> Swap: 1928M Total, 1928M Free >>=20 >> # sysctl kern.maxswzone >> kern.maxswzone: 0 >>=20 >> ??? how to fix/should I fix? >=20 > The amount of swap space you can use is limited by the size of the = data > structures used to manage it. These structures must be preallocated > (otherwise we might deadlock trying to allocate more while already low > on memory) and cannot be swapped out (we wouldn't know how to swap = them > back in) so getting the size right on a memory-constrained system can = be > quite tricky. If you configure more swap than half the amount that = can > be managed, you get the above warning, which you can safely ignore > unless you either need a lot of swap or have very little physical = memory > and don't need much swap. >=20 > See also . >=20 man 8 loader_simp reports: kern.maxswzone . . . Note that swap metadata can be fragmented, which = means that the system can run out of space before it reaches the theoretical limit. Therefore, care should be taken = to not configure more swap than approximately half of the theoretical maximum. . . . =3D=3D=3D Mark Millard marklmi at yahoo.com