From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BFF9C2BC61 for ; Tue, 30 Oct 2018 15:31:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C02052075D for ; Tue, 30 Oct 2018 15:31:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C02052075D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727681AbeJaAY4 (ORCPT ); Tue, 30 Oct 2018 20:24:56 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:39667 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726219AbeJaAY4 (ORCPT ); Tue, 30 Oct 2018 20:24:56 -0400 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 641632012BAC09; Tue, 30 Oct 2018 16:30:57 +0100 (CET) Subject: Re: [PATCH] Revert "genirq/affinity: assign vectors to all possible CPUs" From: Paul Menzel To: Greg Kroah-Hartman Cc: Christoph Hellwig , Ming Lei , stable@vger.kernel.org, Linux Kernel Mailing List , it+linux-scsi@molgen.mpg.de, Adaptec OEM Raid Solutions , linux-scsi@vger.kernel.org, Raghava Aditya Renukunta , Dave Carroll References: <20180811135021.GA2186@kroah.com> <20180813033157.GA18254@ming.t460p> <89f2b622-3d2a-04ce-a6d1-ffb5d9612763@molgen.mpg.de> <7c51fe1d-d591-90f2-8fb5-81990f8db0fe@molgen.mpg.de> <20181001123508.GA3415@lst.de> <3480086a-1a3e-adc2-e127-8e34178da101@molgen.mpg.de> <6b7555c7-8796-eae9-6bd2-b698ccf9559d@molgen.mpg.de> <20181015132142.GA389@kroah.com> Message-ID: <17689ee8-a5bd-1dd1-1458-79e671f816f5@molgen.mpg.de> Date: Tue, 30 Oct 2018 16:30:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms090202060409090802080705" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms090202060409090802080705 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Greg, Hopefully, you enjoyed the maintainers summit, and didn=E2=80=99t have to= o many emails to catch up on. On 10/17/18 17:00, Paul Menzel wrote: > On 10/15/18 15:21, Greg Kroah-Hartman wrote: >> On Mon, Oct 15, 2018 at 02:17:11PM +0200, Paul Menzel wrote: >=20 >>> On 10/01/18 17:59, Paul Menzel wrote: >>> >>>> On 10/01/18 14:43, Paul Menzel wrote: >>>> >>>>> On 10/01/18 14:35, Christoph Hellwig wrote: >>>>>> On Mon, Oct 01, 2018 at 02:33:07PM +0200, Paul Menzel wrote: >>>>>>> Date: Wed, 29 Aug 2018 17:28:45 +0200 >>>>>>> >>>>>>> This reverts commit ef86f3a72adb8a7931f67335560740a7ad696d1d. >>>>>> >>>>>> This seems rather odd. If at all you'd revert the patch adding th= e >>>>>> PCI_IRQ_AFFINITY to aacraid, not core infrastructure. >>>>> >>>>> Thank you for the suggestion, but that flag was added in 2016 >>>>> to the aacraid driver. >>>>> >>>>>> commit 0910d8bbdd99856af1394d3d8830955abdefee4a >>>>>> Author: Hannes Reinecke >>>>>> Date: Tue Nov 8 08:11:30 2016 +0100 >>>>>> >>>>>> scsi: aacraid: switch to pci_alloc_irq_vectors >>>>>> =20 >>>>>> Use pci_alloc_irq_vectors and drop the hand-crafted interrupt = affinity >>>>>> routines. >>>>> >>>>> So what would happen, if `PCI_IRQ_AFFINITY` was removed? Will the >>>>> system still work with the same performance? >>>>> >>>>> As far as I understood, the no regression policy is there for >>>>> exactly that reason, and it shouldn=E2=80=99t matter if it=E2=80=99= s core >>>>> infrastructure or not. As written, I have no idea, and just know >>>>> reverting the commit in question fixes the problem here. So I=E2=80= =99ll >>>>> gladly test other solutions to fix this issue. >>>> >>>> Just as another datapoint, with `PCI_IRQ_AFFINITY` removed from >>>> `drivers/scsi/aacraid/comminit.c` in Linux 4.14.73, the driver >>>> initializes correctly. I have no idea regarding the performance. >>> >>> This commit has not been picked up yet. I guess, you are busy, but >>> in case there are still objections, it=E2=80=99d be great if the two >>> questions below were answered. >>> >>> 1. What bug is fixed in the LTS series by backporting the commit >>> causing the regression? >> >> I can't remember anymore, but unwinding this mess is going to be a >> pain :( >=20 > Agreed. >=20 >>> 2. Why does the *no regression* policy *not* apply in this case? >> >> It does, but also we are following the "stick to what mainline does", >=20 > Hmm, but I thought only for bug fixes. >=20 >> and the fact that this is not showing up in mainline seems just to be = a >> lucky accident at the moment. My real worry is that suddenly you are >> going to have problems there and that this is just the early-warning >> system happening... >=20 > It is still a mystery for me, why it doesn=E2=80=99t happen in master. >=20 > In the current situation, where the SCSI/AACRAID subsystem folks > haven=E2=80=99t joined the discussion, I still think, the best way for = the > Linux 4.14 series is to revert. >=20 > Additionally, there are other reports about errors with the aacraid=20 > driver [1]. I heard they develop against the Linux kernel version in=20 > the enterprise distributions, and then port that to master. Maybe=20 > that is one of the reasons for the current state. (But also > off-topic.) Do you have an update, how to deal with this situation in the LTS series? The longer we wait, the more likely it is, that there will be conflicts in the future releases. Kind regards, Paul > [1]: https://www.spinics.net/lists/linux-scsi/threads.html#123414 --------------ms090202060409090802080705 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG Ti1WZXJlaW4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAMtg1/9moUHN0vqHl4pzq5lN6mc5WqFggEcVToyVsuXPztNXS43O+FZs 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