Date: Sun, 5 Aug 2018 08:02:35 -0700 From: John Kennedy <warlock@phouka1.phouka.net> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: RPI3 swap experiments ["was killed: out of swap space" with: "v_free_count: 5439, v_inactive_count: 1"] Message-ID: <20180805150235.GC30738@phouka1.phouka.net> In-Reply-To: <20180804134015.GA30738@phouka1.phouka.net> References: <201808010405.w7145RS6086730@donotpassgo.dyslexicfish.net> <6BFE7B77-A0E2-4FAF-9C68-81951D2F6627@yahoo.com> <20180802002841.GB99523@www.zefox.net> <20180802015135.GC99523@www.zefox.net> <EC74A5A6-0DF4-48EB-88DA-543FD70FEA07@yahoo.com> <201808030034.w730YURL034270@donotpassgo.dyslexicfish.net> <F788BDD8-80DC-441A-AA3E-2745F50C3B56@yahoo.com> <201808040355.w743tPsF039729@donotpassgo.dyslexicfish.net> <8CC5DF53-F950-495C-9DC8-56FCA0087259@yahoo.com> <20180804134015.GA30738@phouka1.phouka.net>
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On Sat, Aug 04, 2018 at 06:40:15AM -0700, John Kennedy wrote: > For what it's worth, when I was first getting my rpi3 up and running, tuning > swap and rebuilding world+kernel it really seemed to favor killing off ntpd > and then usually a cc during the build (which resulted in a recoverable fail > as I had to restart the build process with NO_CLEAN=yes. > > This was using 12-current kernels. Bumping /tmp (tmpfs) up to 75M (from 50) > and having a proper freebsd-swap (vs swap-on-UFS-file) (and perhaps a V30 SD > card) fixed all of that. I still have to set TMPDIR=/var/tmp (disk, not > tmpfs) during installworld beacuse it tries to strip at least one really big > executable during the install and that'll break with <= 75M of /tmp. Hmm. Not perfect even now. Hit during buildworld with all sources/objects are local (vs NFS-mounted), intended to tweak out this experience for me. Aug 5 01:34:24 rpi3 kernel: pid 63223 (ld.lld), uid 0, was killed: out of swap space Aug 5 01:34:26 rpi3 kernel: pid 63360 (c++), uid 0, was killed: out of swap space Aug 5 01:34:26 rpi3 kernel: pid 846 (ntpd), uid 123, was killed: out of swap space In theory, I have lots of swap (via top) Swap: 7174M Total, 25M Used, 7149M Free, 16K In It varies a bit depending on the kernel, but I haven't adjusted for this particular warning: rpi3 kernel: warning: total configured swap (1946624 pages) exceeds maximum recommended amount (918256 pages). rpi3 kernel: warning: increase kern.maxswzone or reduce amount of swap. So far those have always been somewhere north of 3G: [kernel 12-CURRENT] r336739 -> maximum recommended amount (918488 pages). r336795 -> maximum recommended amount (918488 pages). r336962 -> maximum recommended amount (918256 pages). # gpart show mmcsd0s2 => 0 124624896 mmcsd0s2 BSD (59G) 0 83886080 1 freebsd-zfs (40G) 83886080 25165824 2 freebsd-ufs (12G) 109051904 15572992 4 freebsd-swap (7.4G) So 15572992 512-byte sectors -> 7604MiB -> ~7.42GiB, so that checks out. For swap, 15572992 512-byte sectors is 1946624 4K pages (presumably), so 918256 -> ~3.5GiB as a recommended swap value. Not sure why top shows 7174M. I know I can do a buildworld on my ~1GiB RAM/~2GiB swap amd64 droplet, so that should be excessive swap for the arm64. Of course, I'm not expecting any -j# buildworld to be exactly reproducible where swap comes into play.
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