From owner-freebsd-arm@freebsd.org Sun Apr 21 17:59:54 2019 Return-Path: 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 4494C1592EA8 for ; Sun, 21 Apr 2019 17:59:54 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [104.236.120.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4A1A98219C; Sun, 21 Apr 2019 17:59:53 +0000 (UTC) (envelope-from karl@denninger.net) Received: from denninger.net (ip68-1-57-197.pn.at.cox.net [68.1.57.197]) by colo1.denninger.net (Postfix) with ESMTP id 4B02D21108A; Sun, 21 Apr 2019 13:59:16 -0400 (EDT) Received: from [192.168.10.17] (D7.Denninger.Net [192.168.10.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id ADB1DC8FD6; Sun, 21 Apr 2019 12:59:15 -0500 (CDT) Subject: Re: insanely-high interrupt rates -- PARTIAL resolution (Pi2) To: Ian Lepore , Andrew Gierth Cc: "freebsd-arm@freebsd.org" , ticso@cicely.de References: <004ddba628b94b80845d8e509ddcb648d21fd6c9.camel@freebsd.org> <20190319161423.GH57400@cicely7.cicely.de> <52df098fdc0caf5de1879c93239534fffbd49b56.camel@freebsd.org> <40f57de2-2b25-3981-a416-b9958cc97636@denninger.net> <669892ac3fc37b0843a156c0ab102316829103fd.camel@freebsd.org> <663f2566-b035-7011-70eb-4163b41e6e55@denninger.net> <20190325164827.GL57400@cicely7.cicely.de> <3db9cf8a-68ee-e339-67bf-760ee51464fd@denninger.net> <874l7fyrpr.fsf@news-spur.riddles.org.uk> <701e011f-3088-8ed4-4fbb-6fa93ac698f5@denninger.net> <67133e19-2be5-ccd1-2ded-008b36a866ec@denninger.net> From: Karl Denninger Openpgp: preference=signencrypt Autocrypt: addr=karl@denninger.net; prefer-encrypt=mutual; keydata= mQINBFIX1zsBEADRcJfsQUl9oFeoMfLPJ1kql+3sIaYx0MfJAUhV9LnbWxr0fsWCskM1O4cV tHm5dqPkuPM4Ztc0jLotD1i9ubWvCHOlkLGxFOL+pFbjA+XZ7VKsC/xWmhMwJ3cM8HavK2OV SzEWQ/AEYtMi04IzGSwsxh/5/5R0mPHrsIomV5SbuiI0vjLuDj7fo6146AABI1ULzge4hBYW i/SHrqUrLORmUNBs6bxek79/B0Dzk5cIktD3LOfbT9EAa5J/osVkstMBhToJgQttaMIGv8SG CzpR/HwEokE+7DP+k2mLHnLj6H3kfugOF9pJH8Za4yFmw//s9cPXV8WwtZ2SKfVzn1unpKqf wmJ1PwJoom/d4fGvQDkgkGKRa6RGC6tPmXnqnx+YX4iCOdFfbP8L9rmk2sewDDVzHDU3I3ZZ 8hFIjMYM/QXXYszRatK0LCV0QPZuF7LCf4uQVKw1/oyJInsnH7+6a3c0h21x+CmSja9QJ+y0 yzgEN/nM89d6YTakfR+1xkYgodVmMy/bS8kmXbUUZG/CyeqCqc95RUySjKT2ECrf9GhhoQkl +D8n2MsrAUSMGB4GQSN+TIq9OBTpNuvATGSRuF9wnQcs1iSry+JNCpfRTyWp83uCNApe6oHU EET4Et6KDO3AvjvBMAX0TInTRGW2SQlJMuFKpc7Dg7tHK8zzqQARAQABtCNLYXJsIERlbm5p bmdlciA8a2FybEBkZW5uaW5nZXIubmV0PokCPAQTAQIAJgUCUhfXOwIbIwUJCWYBgAYLCQgH AwIEFQIIAwQWAgMBAh4BAheAAAoJEG6/sivc5s0PLxQP/i6x/QFx9G4Cw7C+LthhLXIm7NSH AtNbz2UjySEx2qkoQQjtsK6mcpEEaky4ky6t8gz0/SifIfJmSmyAx0UhUQ0WBv1vAXwtNrQQ jJd9Bj6l4c2083WaXyHPjt2u2Na6YFowyb4SaQb83hu/Zs25vkPQYJVVE0JX409MFVPUa6E3 zFbd1OTr3T4yNUy4gNeQZfzDqDS8slbIks2sXeoJrZ6qqXVI0ionoivOlaN4T6Q0UYyXtigj dQvvhMt0aNowKFjRqrmSDRpdz+o6yg7Mp7qEZ1V6EZk8KqQTH6htpCTQ8i79ttK4LG6bstSF Re6Fwq52nbrcANrcdmtZXqjo+SGbUqJ8b1ggrxAsJ5MEhRh2peKrCgI/TjQo+ZxfnqEoR4AI 46Cyiz+/lcVvlvmf2iPifS3EEdaH3Itfwt7MxFm6mQORYs6skHDw3tOYB2/AdCW6eRVYs2hB RMAG4uwApZfZDKgRoE95PJmQjeTBiGmRPcsQZtNESe7I7EjHtCDLwtJqvD4HkDDQwpzreT6W XkyIJ7ns7zDfA1E+AQhFR6rsTFGgQZRZKsVeov3SbhYKkCnVDCvb/PKQCAGkSZM9SvYG5Yax 8CMry3AefKktf9fqBFg8pWqtVxDwJr56dhi0GHXRu3jVI995rMGo1fLUG5fSxiZ8L5sAtokh 9WFmQpyl Message-ID: <79f1cd3a-e7e9-de26-d728-0d463f1f4291@denninger.net> Date: Sun, 21 Apr 2019 12:59:16 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2019 17:59:54 -0000 This is a cryptographically signed message in MIME format. --------------ms070307020606090102050106 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 4/21/2019 12:57, Ian Lepore wrote: > On Wed, 2019-04-17 at 14:56 -0500, Karl Denninger wrote: >> On 4/9/2019 19:25, Ian Lepore wrote: >>> On Tue, 2019-04-09 at 09:55 -0500, Karl Denninger wrote: >>>> On 4/3/2019 11:48, Andrew Gierth wrote: >>>>> [...] >>> I've just posted https://reviews.freebsd.org/D19871 for this.=20 >>> Hopefully I'll get it committed in a day or so and merged to 12- >>> stable >>> a few days after that. >>> >>> -- Ian >> I am running that now on a Pi2 and so far the load problem is gone >> but >> the spurious interrupt warnings are not.... >> >> > [...] >> On my bench without the I2c inputs connected (which do analog reads) I= >> do NOT get the spurious interrupt prints. With it connected I do. Th= e >> process that reads them is code that is running in both cases, but if = it >> cannot find the I2c devices it logs the error but continues, so all it= >> gets to is trying to open the unit, doesn't see it when probed, and >> gives up. >> >> It appears that I2c is an inherent part of the spurious interrupt thin= g >> still and while the timer issue appears to be fixed that doesn't resol= ve >> the other problem. >> >> Any ideas on how to track down exactly what is generating those warnin= gs? >> >> > After spending the whole day yesterday trying all the usual driver > techniques for eliminating spurious interrupts, I was unable to make > them go away completely, but I also convinced myself they're harmless. > > I was a little surprised that the "read after write" technique didn't > work. That is, after writing to the i2c control register to clear all > the interrupt-enable bits, read back that register. In theory, at > least on normal arm chips, that ensures that the prior write has > reached the hardware before the read can procede, so it's a way to > guarantee that the write has taken effect and the interrupt can no > longer be asserted, before returning from the interrupt handler. But, > on the rpi chips even that doesn't work... you can read back the > register and verify the interrupt-enable bits are cleared, and still > after returning from the handler, it re-interrupts immediately. > > If you stick in a nice long DELAY() after clearing the control > register, the spurious interrupts go away, but that's a horrible fix.=20 > It would be especially horrible for i2c devices that do a lot of > transfers, you'd end up with the delay time overwhelming the time to do= > the actual transfers themselves. > > So, in r346489, I moved the reporting of the spurious transfers under > the bootverbose flag, so that normally you just won't see them anymore,= > but we can still enable the reporting if we suspect some device driver > is behaving badly. I'll mfc that change to 12-stable after a few days.= > > -- Ian Thanks... --=20 Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms070307020606090102050106 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD dWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExJTAjBgNVBAMMHEN1 ZGEgU3lzdGVtcyBMTEMgMjAxNyBJbnQgQ0EwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIK 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