Date: Wed, 18 Jul 2018 07:42:13 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: freebsd-arm@freebsd.org Subject: Re: RPI3 swap experiments Message-ID: <F31DD1B5-42A8-4A48-A771-D38479604FD5@yahoo.com> In-Reply-To: <20180718060650.GA24566@www.zefox.net> References: <20180629155131.GA35717@www.zefox.net> <c6b8842a-fcc5-8e11-5a03-ba76eb3c5dea@sentry.org> <20180629233937.GC35717@www.zefox.net> <0f137e06-214a-3e8c-a216-f061ec04ac2c@sentry.org> <20180630005145.GA43801@www.zefox.net> <6f3406e2-71f3-d0c2-2b65-703e1a1d3c25@sentry.org> <8e92b2b7-da61-3efb-7231-9fac76b2c1d4@sentry.org> <ba33d8a7-a849-3893-8016-0765ebe1c51f@sentry.org> <2deaaec3-f78f-0b09-5ca7-27e14c6979f9@sentry.org> <20180704004554.GA61273@www.zefox.net> <20180718060650.GA24566@www.zefox.net>
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On 2018-Jul-17, at 11:06 PM, bob prohaska <fbsd at www.zefox.net> wrote: > It appears that some progress has been made in getting swap working = reasonably > on the RPI3. A -j4 buildworld attempt running r336356 to compile = 336431 failed > with "out of swap" but the worst read and write delays were less than = 5 seconds, > a marked improvement over previous examples. Attributing the time variations that have been observed mostly to = FreeBSD and not mostly to the device at issue seems to have little or no evidence to = support it. > In this case swap was split, 2 each 1GB partitions on USB flash plus = 1 GB on the=20 > microSD card. Previous attempts using 3 each 1 GB partitions on USB = flash have been > repeatedly successful, while a single attempt using 3 each 1GB = partitions on microSD > failed. The more swap partitions (or space?) not on a /dev/mmcsd0s* the less of = the activity that /dev/mmcsd0 handles and likely the more time it tends to = have between explicit operations to do internal housekeeping before the next explicit operation. So the better approximation to not using /dev/mmcsd0 at all might not be all that much of a surprise at having less of a problem on the device (or a problem less often). > Details are at > = http://www.zefox.net/~fbsd/rpi3/swaptests/r336356/2gbusbflash_1gbsdflash/ =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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