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Date:      Sun, 12 Aug 2018 09:23:05 +1000
From:      Trev <freebsd-arm@sentry.org>
To:        "freebsd-arm@freebsd.org" <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:  <64798536-4ba5-24e9-304b-30cfb5b702d0@sentry.org>
In-Reply-To: <20180811163209.GA38922@www.zefox.net>
References:  <EC74A5A6-0DF4-48EB-88DA-543FD70FEA07@yahoo.com> <20180806155837.GA6277@raichu> <20180808153800.GF26133@www.zefox.net> <20180808204841.GA19379@raichu> <20180809065648.GB30347@www.zefox.net> <20180809152152.GC68459@raichu> <CANCZdfpKOTBrxiNhaeHHRp-2iw5a4eXt%2Bmd_1LTD-c0%2BAE6qxg@mail.gmail.com> <20180809153710.GC30347@www.zefox.net> <CANCZdfrC0s8X-LxJmrDmkxmz%2BGUMNsHSMpBEQmp1S5ahcvptpg@mail.gmail.com> <20180810044426.GB32974@www.zefox.net> <20180811163209.GA38922@www.zefox.net>

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bob prohaska wrote on 12/08/2018 02:32:
> Simply moving all swap to microSD (and leaving vm.pageout_oom_seq at the
> default value of 12) allowed an uneventul -j4 buildworld on r337226M,
> upgrading to r337564M with the patches suggested to date still in place.
> There were no warnings or errors on the console or controlling terminal.
> 
> The microSD card used for /root, /tmp and swap is a Sandisk Ultra, supposedly
> a notch or two slower than the Sandisk Extreme USB flash drive that caused
> all the trouble.

Curious, my experience was the opposite - the 16G SanDisk Ultra had OOM 
swap issues with -j4 buildworld, whereas the 32G SanDisk Extreme 
doesn't. Both cards were new at the time.

Note: in my case all file systems were on the micro-SD card except for 
/tmp/ (100M),  /var/tmp (15M) and /var/log (15M) which were memory disks.

I'd retest with the sysctl and patches but I have to be interstate again 
for a few days :(



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