Date: Thu, 4 Sep 2025 01:44:34 -0700 From: Mark Millard <marklmi@yahoo.com> To: Graham Perrin <grahamperrin@gmail.com> Cc: freebsd-pkg@freebsd.org, freebsd-pkgbase@freebsd.org Subject: Re: pkg upgrade, vm.pageout_oom_seq: swap off: UFS, ZFS Message-ID: <5E925F70-5B0C-4204-8EA4-8AD70F99794F@yahoo.com> In-Reply-To: <08b3521f-d29d-4f9b-affe-68a0fc35ed59@gmail.com> References: <D2C64F39-B6EA-47BD-B88E-B4D729BE0150@yahoo.com> <0dbf8c95-7697-4887-a890-335c3ccd80f1@gmail.com> <29ff7f7e-12ef-4d10-8ca4-15ae35ce6bae@gmail.com> <19251E67-BC92-4D71-9E71-6C7546A46D8C@yahoo.com> <ef9ca09f-72e0-4489-a779-2debc161d770@gmail.com> <9300201D-9D53-449B-9F0A-DFF6194B2830@yahoo.com> <6d1606ac-8ad0-4f15-96c7-30c6f50ca9b9@gmail.com> <73877048-A3B4-4920-AC92-A8C7A4FF83B5@yahoo.com> <2f455675-609b-40b5-9dab-5f006156bac6@gmail.com> <36F5A8E1-7F72-48C0-A8D7-428E91488B70@yahoo.com> <08b3521f-d29d-4f9b-affe-68a0fc35ed59@gmail.com>
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On Sep 4, 2025, at 00:17, Graham Perrin <grahamperrin@gmail.com> wrote: > On 04/09/2025 01:53, Mark Millard wrote: > >> On Sep 3, 2025, at 17:14, Graham Perrin <grahamperrin@gmail.com> wrote: >> >>> … >>> >>> Here, with 3 G, fast storage, and swap off: UFS and ZFS seemed much the same. >>> >>> RELEASE, quarterly. >>> >>> … >> You do not report observations of how large the >> Swap Used got to be … > > > "swap off" in the subject line, and above ;-) Which is what limits the information about how close your were to having problems when it did not OOM: Ifr it was just barely working, little Swap Space left, that is rather different than if SWAP was nearly unused, for example. That "swap off" choice is what I was referencing. But I did not write enough for my reference to make any sense. Thus my later note that did try to indicate why for what would be an example of monitoring "swap on" behavior (Swap Used sampling). > I began focusing on fast storage after realising that with slow storage, there seems to be a massive risk reduction with > vm.pageout_oom_seq=120 Yep. === Mark Millard marklmi at yahoo.comhome | help
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