From owner-freebsd-arm@freebsd.org Wed Jun 27 02:09:22 2018 Return-Path: <owner-freebsd-arm@freebsd.org> Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5C5361027E67 for <freebsd-arm@mailman.ysv.freebsd.org>; Wed, 27 Jun 2018 02:09:22 +0000 (UTC) (envelope-from marklmi@yahoo.com) Received: from sonic311-23.consmr.mail.ne1.yahoo.com (sonic311-23.consmr.mail.ne1.yahoo.com [66.163.188.204]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C92C78E1D8 for <freebsd-arm@freebsd.org>; Wed, 27 Jun 2018 02:09:21 +0000 (UTC) (envelope-from marklmi@yahoo.com) X-YMail-OSG: dmQxc18VM1kH4nOajh72mAQ5mhr15yHIrL4t0J5pZA09_.NdrL0kl7MKBa21v6S pR.4eDwwCHzpm2mz3oC_lYQ7dJwqWx69cU2vDffuGaJPdjMKg4FHoBIiLu0ubGAwrqVaW9MSwKQn HdNkgZGYiwGvfgBJV3XubcjtuhlZl3P0iaiCRAkTkqYJfbpPd8AplpRc43f68L5k_Xb5boNg6im3 YU9JYpufvTjBPCOdxOul5sQC7KarUHKlaAdBzkIu3BRbLKWHBtGEZJvxoo0yhw7Obuw5FEwtoJsJ x4k4iJ6Zx5gBgWj8xUUfV6rsUqHL_o4BSkOZTvUtRLcIiRYLDab7I0sbM1mERHfE5K4UDdJV9DWF rb9.N9ztrbtmFRv7csOy.dboL.XxHAwVgPHadzMxDqfcvdHPpJSwLFfBAdiVSJkppTtUAM4XO2V6 YeNAQEuC7WE0vbmzKnCuek7jPGGpb2GBrAlU6e_CKIyzoOSsQhes0cfdkSLKkKSIouLVM.NWHXOt rr2nTXhDvoxsnxOZS2FK5Fsi1bojTbokqYXRibdSlqpPuR5iCqJoCnOYBeOqzMnBMkLmLm_uku2H 1w.W9b7Foo6uH5P0qqcvW4wiCIRBCgrr7j46zymTw.DlVNUOp2jjgLMNXOKeLoCOuVQ4lSFDYaF9 q0Kn8uI_mNJClj8FoiAvykM.J1HXYvtkmjHbH67OUneauykzImSWZXRO7c8jaScKs2g5ExoTulld INuDOk4KoXJJTMIdad8Ti8iozLu.m.JG2nSM02Eji4.fpOeBzENzi1qtk7kpyzfvCifsA6460vfi 7W6sa8OmAcVvM2D21ZEVoQiPRtihBmt3cbi5tvyzXzUEBwQdvcPCi6mFhvR6QYPnRiTH8elfjr2F .H.Lbl2s.whZL8MA.dsOcooMEWFi37P85PzczCkN4kMoKsPDiVvCVezko1J2bkaojPjTQziHwGEC fDp12ZVTt6RSzGX.jBYfpoi9wOedOMdrx5A-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic311.consmr.mail.ne1.yahoo.com with HTTP; Wed, 27 Jun 2018 02:09:15 +0000 Received: from ip70-189-131-151.lv.lv.cox.net (EHLO [192.168.0.105]) ([70.189.131.151]) by smtp401.mail.ne1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 0696509309fab90cd916918bf738bac6; Wed, 27 Jun 2018 02:09:10 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.4 \(3445.8.2\)) Subject: Re: RPI3 swap experiments, was Re: GPT vs MBR for swap devices From: Mark Millard <marklmi@yahoo.com> In-Reply-To: <20180626222834.GA20270@www.zefox.net> Date: Tue, 26 Jun 2018 19:09:09 -0700 Cc: Jamie Landeg-Jones <jamie@catflap.org>, Warner Losh <imp@bsdimp.com>, freebsd-arm <freebsd-arm@freebsd.org> Content-Transfer-Encoding: 7bit Message-Id: <28012DFB-37A0-461A-BB62-CD3EE61E82F0@yahoo.com> References: <20180623143218.GA6905@www.zefox.net> <03C2D3C4-6E90-4054-AF79-BD7FE2B7958D@yahoo.com> <20180624231020.GA11132@www.zefox.net> <C87C40CF-15B2-4137-892C-F2ADBAB32418@yahoo.com> <20180626052451.GA17293@www.zefox.net> <CANCZdfpXyzxzOZ8pqcRtuFsxYx5Jjs9oSL1ok2sGVPHdiB0qVQ@mail.gmail.com> <201806261040.w5QAeBKq035183@donotpassgo.dyslexicfish.net> <A6986B21-FF6E-48F5-9F3A-06B3D2A92C55@yahoo.com> <20180626151843.GD17293@www.zefox.net> <3525D7C7-F848-45A1-BD85-2DAC895DF48C@yahoo.com> <20180626222834.GA20270@www.zefox.net> To: bob prohaska <fbsd@www.zefox.net> X-Mailer: Apple Mail (2.3445.8.2) X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: "Porting FreeBSD to ARM processors." <freebsd-arm.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-arm>, <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm/> List-Post: <mailto:freebsd-arm@freebsd.org> List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-arm>, <mailto:freebsd-arm-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 27 Jun 2018 02:09:22 -0000 On 2018-Jun-26, at 3:28 PM, bob prohaska <fbsd at www.zefox.net> wrote: > On Tue, Jun 26, 2018 at 01:15:54PM -0700, Mark Millard wrote: >> On 2018-Jun-26, at 8:18 AM, bob prohaska <fbsd at www.zefox.net> wrote: >> >>> On Tue, Jun 26, 2018 at 07:37:59AM -0700, Mark Millard wrote: >>>> >>>> >>>> . . . >>>> >>>> As I remember, Bob P. Did reproduce drive errors even without >>>> the problem drive being used for swapping. This too suggests >>>> (A) as separate activity. >>>> >>> Indeed, it is a requirement. If the suspect device is used for swapping >>> OOMA kills prevent the test from progressing to the point of failure. >>> >> >> Looking back at http://www.zefox.net/~fbsd/rpi3/swaptests/ >> and information about /dev/da0 rive errors it does not >> appear that a combination with: >> >> A) sufficient swap (> 1.5 GiByte total?) but no use of swap on >> any partition on /dev/da0 >> and: >> B) use of /dev/da0 for /usr/ and /var/ >> and: >> C) Records from the console showing errors (or notes >> indicating lack of such errors). >> >> exists. So I was remembering incorrectly. >> >> I'm not claiming such a combination is the best direction for >> the next tests, but absent such tests there is no >> compare/contrast to know if /dev/da0 would still get errors >> despite the system having sufficient swap present on other >> drives. Thus, I would not go so far as "is a requirement" on >> the evidence available. >> > > I just didn't bother to record successful runs. I'm logging one now. > >> We do have evidence for the system having insufficient swap >> space: this context seems to have the current status "is >> sufficient but might not be necessary" for /dev/da0 >> getting drive errors. >> > Not sure I understand here. Basically there seem to be three cases: > Enough swap not on da0, -j4 buildworld completes. > Any swap on da0, -j4 buildworld is killed by OOMA > Not enough swap not on da0, -j4 buildworld crashes the machine eventually. > > Are there other combinations I've overlooked? The first two don't seem > worth repeating, at least not often. "buildworld completes with /dev/da0 errors" vs. "buildworld completes without /dev/da0 errors" (for: enough swap not on /dev/da0 with no swap on /dev/da0 ). That is a little simplistic, as there can be multiple retries before FreeBSD gives up. Normal is no retries needed. Going from rare single retries to frequent multiple retries but no giving-up to it giving up sometimes is all abnormal as I understand. But there are degrees of abnormal. And, yes, I have had past examples of significant drive reports during buildworld that let buildworld appear to complete. (Not that I trusted the result or the drive involved after such, at least as the drive was powered/connected at the time.) For "any swap on da0" and "not enough swap not on da0" (with no swap on da0) I'd add to your descriptions: "with /dev/da0 errors" (again simplistic). This goes along with my suggestion to split the /dev/da0 error investigation from the investigations of OMMA behavior and crashing-the-machine: avoiding any confounding. (For now I do not have access to a context for doing rpi3 examples myself.) === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)