Date: Fri, 16 Oct 2020 11:35:42 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: FreeBSD using swap even though there's a lot of free memory Message-ID: <CAHu1Y72pNNXt-i552F2JT%2ButhqAMjQdXLoRNofw6Xr0iwenjVw@mail.gmail.com> In-Reply-To: <5f885b772d622_95aa2adab2b9c5b41576495c3@sirportly-app-02.mail> References: <5f885b772d622_95aa2adab2b9c5b41576495c3@sirportly-app-02.mail>
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On Thu, Oct 15, 2020 at 7:24 AM Twingly Customer Support <team@twingly.com> wrote: > Hi, > > We have a server running FreeBSD 12.1-RELEASE-p10. We currently have a > problem where FreeBSD starting to swap when running ZFS scrub, even thoug= h > we have ~70G of free memory. tl;dr =E2=80=93 this is normal, nothing to see, move along. It's not "swapping" =E2=80=93 it's paging pre-emptively. If you're used to= Linux, you might think "swap bad" ;-) There is a lot of history to VM management in BSD. This might be an easy place to start: https://flylib.com/books/en/2.849.1.78/1/ --=20 "Well," Brahm=C4=81 said, "even after ten thousand explanations, a fool is = no wiser, but an intelligent person requires only two thousand five hundred." - The Mah=C4=81bh=C4=81rata
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