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Date:      Fri, 13 Sep 2019 21:33:02 +1000
From:      Trev <freebsd-arm@sentry.org>
To:        FreeBSD-arm <freebsd-arm@freebsd.org>
Subject:   Re: spurious out of swap kills
Message-ID:  <dafa24f1-51e9-907c-1802-fe86243e2982@sentry.org>
In-Reply-To: <20190913055332.GN2559@kib.kiev.ua>
References:  <tkrat.84b3295682c83162@FreeBSD.org> <20190913000635.GG8397@raichu> <tkrat.1a0e98a230c1a223@FreeBSD.org> <20190913055332.GN2559@kib.kiev.ua>

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[From the FreeBSD-Current mailing list]

Konstantin Belousov wrote on 13/09/2019 15:53:
> Basically, page fault handler waits for vm.pfault_oom_wait *
> vm.pfault_oom_attempts for a page allocation before killing the process.
> Default is 30 secs, and if you cannot get a page for 30 secs, there is
> something very wrong with the machine.

This may well explain the oom kills that were being experienced on 
several Raspberry Pi 3B+ boards using the microSD as swap and why 
upgrading the microSD to the fastest available or using a USB attached 
hard drive did not suffer from the issue.




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