Date: Sat, 4 Jan 2025 14:03:53 -0800 From: Craig Leres <leres@freebsd.org> To: Karl Denninger <karl@denninger.net>, freebsd-hackers@freebsd.org Subject: Re: curious crashes when under memory pressure Message-ID: <04794cad-eda5-4ab8-ae29-4cc4d53ac033@freebsd.org> In-Reply-To: <12dcc55d-67ae-467b-9249-3d60047d05f0@denninger.net> References: <CAPx1GvfwqFqvMm0RkTvxa4BJStvOdG0=pNx2dCuWEzCXsqhqHw@mail.gmail.com> <slrnvnij2h.26bu.pmc@disp.intra.daemon.contact> <CAPx1GvfOh4g1AeOcYXC26W5jbPAgA_E_t7CW9chg4miC8c15-w@mail.gmail.com> <9e71d8eb-74c3-4bcb-89b1-90d4f9746168@quip.cz> <33db3282-25c4-42fb-8d97-1918d52fa9e2@denninger.net> <4094b79b-c54a-4953-b693-1b4e8387cf9f@freebsd.org> <slrnvnj05d.27gd.pmc@disp.intra.daemon.contact> <87928610-fcad-400e-b7b3-076c6d3f1200@freebsd.org> <12dcc55d-67ae-467b-9249-3d60047d05f0@denninger.net>
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On 1/4/25 13:49, Karl Denninger wrote: > That's a reasonable justification for mirroring the swap (despite the > fact that you are then doing two I/Os on a write to it instead of one, > albeit on different devices) but then I'd still get it out of ZFS' > domain and run the swap to a bare GPT partition under gmirror instead > simply because ZFS can demand a RAM allocation to do things and swap > space is by definition something used under significant memory pressure > which implies you can need it within ZFS and not be able to get it. Chris said he was "swapping to a zfs mirror" but I'm swapping to a gmirror. Craig
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