Date: Thu, 12 Nov 2015 20:47:29 +0100 From: Michael Tuexen <tuexen@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Memory management issue on RPi? Message-ID: <29DB8CF5-7569-4139-885A-8496993805A7@freebsd.org> In-Reply-To: <20151112180954.GP2257@kib.kiev.ua> References: <CB20D8FA-303C-4AA2-B2A6-1FF25DDB8A94@freebsd.org> <20151112121825.GJ2257@kib.kiev.ua> <BE0B4761-54EC-4632-BA23-A3C373D419AE@freebsd.org> <20151112171221.GO2257@kib.kiev.ua> <984BA2E2-DD1A-4D05-858B-362192660E54@freebsd.org> <20151112180954.GP2257@kib.kiev.ua>
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> On 12 Nov 2015, at 19:09, Konstantin Belousov <kostikbel@gmail.com> = wrote: >=20 > On Thu, Nov 12, 2015 at 06:57:03PM +0100, Michael Tuexen wrote: >>> On 12 Nov 2015, at 18:12, Konstantin Belousov <kostikbel@gmail.com> = wrote: >>>=20 >>> On Thu, Nov 12, 2015 at 05:25:37PM +0100, Michael Tuexen wrote: >>>>> On 12 Nov 2015, at 13:18, Konstantin Belousov = <kostikbel@gmail.com> wrote: >>>>> This is a known problem with the swap-less OOM. The following = patch >>>>> should give you an immediate relief. You might want to tweak >>>>> sysctl vm.pageout_oom_seq if default value is not right, it was = selected >>>>> by 'try and see' approach on very small (32 or 64MB) i386 VM. >>>> It just works... Will do some more testing... >>>=20 >>> I am more interested in report if OOM was triggered when it should. >> How do I know? What output do you want to see? >>=20 >> Best regards >> Michael >>>=20 >>> Try running several instances of 'sort /dev/zero'. > ^^^^^^^^^^^^^ I already answered this. > Run sort /dev/zero, and see whether OOM fires. OK, now I understand. You want to see if some processes are getting = killed. (I was thinking that you might want to see some sysctl counters or so). Results: * I'm able to compile/link/install a kernel from source. This was not possible before. * When running three instances of sort /dev/zero, two of them get killed after a while (less than a minute). One continued to run, but got also kill eventually. All via ssh login. Let me know if you want me to do some more testing. Best regards Michael >=20
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