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 10C6CC04AA5 for ; Mon, 15 Oct 2018 12:17:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A88492083C for ; Mon, 15 Oct 2018 12:17:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A88492083C 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 S1726636AbeJOUCS (ORCPT ); Mon, 15 Oct 2018 16:02:18 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:50673 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726400AbeJOUCR (ORCPT ); Mon, 15 Oct 2018 16:02:17 -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 2945B2012D0DC1; Mon, 15 Oct 2018 14:17:12 +0200 (CEST) Subject: Re: [PATCH] Revert "genirq/affinity: assign vectors to all possible CPUs" To: Christoph Hellwig , Greg Kroah-Hartman Cc: 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: <06ee23fe-ec9e-d67b-b533-d5151be74a11@molgen.mpg.de> <20180810133628.GA4131@kroah.com> <29b5f3ce-2c23-bf5e-fe50-29bedd4833e1@molgen.mpg.de> <20180810155511.GA17092@kroah.com> <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> From: Paul Menzel Message-ID: <6b7555c7-8796-eae9-6bd2-b698ccf9559d@molgen.mpg.de> Date: Mon, 15 Oct 2018 14:17:11 +0200 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: <3480086a-1a3e-adc2-e127-8e34178da101@molgen.mpg.de> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms000009010302030600030306" 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. --------------ms000009010302030600030306 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Greg, dear Linux folks, On 10/01/18 17:59, Paul Menzel wrote: > On 10/01/18 14:43, Paul Menzel wrote: >=20 >> 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 the >>> 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 aff= inity >>> 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=99s c= ore >> 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=99= ll >> gladly test other solutions to fix this issue. >=20 > 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? 2. Why does the *no regression* policy *not* apply in this case? Kind regards, Paul [1]: Documentation/process/stable-kernel-rules.rst --------------ms000009010302030600030306 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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