From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933200AbcFOPnq (ORCPT ); Wed, 15 Jun 2016 11:43:46 -0400 Received: from mail-bl2on0062.outbound.protection.outlook.com ([65.55.169.62]:38560 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932698AbcFOPnm (ORCPT ); Wed, 15 Jun 2016 11:43:42 -0400 Authentication-Results: spf=pass (sender IP is 63.163.107.21) smtp.mailfrom=sandisk.com; vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=bestguesspass action=none header.from=sandisk.com; X-AuditID: ac160c69-33fff70000000bcf-90-5761731d8a93 Subject: Re: [PATCH 02/13] irq: Introduce IRQD_AFFINITY_MANAGED flag To: Keith Busch References: <1465934346-20648-1-git-send-email-hch@lst.de> <1465934346-20648-3-git-send-email-hch@lst.de> <0412b942-ea0d-d4eb-c724-8243d12ff6f3@sandisk.com> <20160615102311.GA16619@lst.de> <67ef7a1c-56e1-db2c-b038-f9784fc1f52f@sandisk.com> <20160615151415.GA1919@localhost.localdomain> CC: Christoph Hellwig , "tglx@linutronix.de" , "axboe@fb.com" , "linux-block@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-kernel@vger.kernel.org" From: Bart Van Assche Message-ID: <7f0b16bd-b39f-99e6-c1c1-6a508bf9bbbf@sandisk.com> Date: Wed, 15 Jun 2016 17:28:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <20160615151415.GA1919@localhost.localdomain> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupmkeLIzCtJLcpLzFFi42JZI8azSFeuODHcYMVHa4v/e46xWaxcfZTJ 4t7RL0wWe29pW1zeNYfNYv6yp+wWZ+cdZ7PYvGkqswOHx8Tmd+wei/e8ZPJ4d+4cu8fmJfUe u282sHl83iQXwBbFZZOSmpNZllqkb5fAlXHu2AHmgrPsFaf/7mRvYJzJ1sXIySEhYCJxd8JJ li5GLg4hgblMEk0zNrCCJIQEdjBKnLzvDVO0dvpsZoiipYwS36/MZQFJCAu4SDRe+8oMYosI qEv8+/WKDaJ5OZPEvSXOIA3MAu+YJG7f+AFWxCZgJPHt/UywZl4BO4lVJ16DbWMRUJWY+mQL E4gtKhAh0ftrCVSNoMTJmU/AbE4BK4mNV1YygtjMAhYSM+efh7LlJba/nQN2nYTAVVaJhikz mSGuUJc4uWQ+0wRG4VlIZs1C0j8LSf8CRuZVjGK5mTnFuempBYamesWJeSmZxdl6yfm5mxgh UZS5g/HuE+9DjAIcjEo8vBL2CeFCrIllxZW5hxglOJiVRHgVCxPDhXhTEiurUovy44tKc1KL DzFKc7AoifO63fsSJiSQnliSmp2aWpBaBJNl4uCUamBU9FuwaPHrNikH231MqTwPfHblf196 /LKIopCGRJuLYV3w/rL1TgkquqFCH/8FFvyfPe33wowkR7sV81d5nOpWmKxt7as1UfeoRMPp FTylUw3SVT6I/F6jYjvFcdEB264LPPUz0l7O1Z6whH/7w5+x4syrbL+Uis3dsqat5uTeAxw7 l8yP4DugxFKckWioxVxUnAgALq8nEZ4CAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpkluLIzCtJLcpLzFFi42Lh2siRomtfkhhucGKqhsX/PcfYLFauPspk ce/oFyaLvbe0LS7vmsNmMX/ZU3aLs/OOs1ls3jSV2YHDY2LzO3aPxXteMnm8O3eO3WPzknqP 3Tcb2Dw+b5ILYIvisklJzcksSy3St0vgyjh37ABzwVn2itN/d7I3MM5k62Lk5JAQMJFYO302 cxcjF4eQwGJGiY6jK1hBEsICLhKN174yg9giAuoS/369AmsQEljOJHFviTNIA7PAOyaJO0e/ MoEk2ASMJL69n8kCYvMK2EmsOvEabBCLgKrE1CdbwGpEBSIken8tgaoRlDg58wmYzSlgJbHx ykpGEJtZwExi3uaHzBC2vMT2t3OYJzDyzULSMgtJ2SwkZQsYmVcxiuVm5hTnpmcWGBrqFSfm pWQWZ+sl5+duYgQHMmfkDsanE80PMTJxcEo1MDoI9Ppt1r1iYLRoVa/iH6O5Eeey4hsc+B0c V72xTdtz269VV2zy9NeJ9cybytNvc0TEKPbsylO1E2HOXfKrpU0rrD+z6fB8pyJLT+/2VoVt XZJfXSWzjZK6NhU2fPje1HFmjXVOoPyM2dv2sVxI9tJxXq5Qt34Ne4HT/igDhv53X3x2OR9R YinOSDTUYi4qTgQAC5OOuhQCAAA= X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:63.163.107.21;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(6009001)(7916002)(2980300002)(438002)(189002)(24454002)(377454003)(199003)(86362001)(65806001)(83506001)(4326007)(81166006)(189998001)(8676002)(11100500001)(5003600100002)(110136002)(54356999)(8936002)(23676002)(50466002)(53416004)(93886004)(4001350100001)(47776003)(2270400002)(81156014)(65956001)(356003)(2906002)(97736004)(31686004)(106466001)(64126003)(69596002)(87936001)(6806005)(36756003)(5008740100001)(33646002)(76176999)(230700001)(92566002)(586003)(50986999)(77096005)(68736007)(31696002)(2950100001)(65826006);DIR:OUT;SFP:1101;SCL:1;SRVR:BY2PR02MB521;H:milsmgep15.sandisk.com;FPR:;SPF:Pass;PTR:InfoDomainNonexistent;MX:1;A:1;LANG:en; X-Microsoft-Exchange-Diagnostics: 1;BY2FFO11FD044;1: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 X-MS-Office365-Filtering-Correlation-Id: 747a7b3c-6803-40a3-15e1-08d39531c9ba X-Microsoft-Exchange-Diagnostics: 1;BY2PR02MB521;2:YRN/JG6W/Klhg2YW07qFtXGtuI/25u1PZEsbfTfd6tuKJejbn3tl9DPSSsrZzfTyp0wxDPrQ/VPPcVWpJSnwiyPfVaRfDNCKDUZaUGs7OYZbz1nAyWRJqtChBw+u4SIyNLzt4ThZv1R3hEq27t+bkrKiOw/ydkMBQw72l8Y8iIdMTUlQhNhVhhcr2k8kW/Om;3:yTlD7fKiWsrMKtlhsurC9382jiEHms5U7h5Og9fYaQI7+BmMtOcJW3lrn0FpKlNzwiITalOjPIzKId0+Ls9pKt76oEY8MldJX1BbUfC6i9OrgVSEZc1UbnPxsez/4LiOnV2x1ooR1uV7n74hLvIIRl+NUL0KzNW3JVTp1W1bMJuhvcpFqWBIHgYoZzDbfS16PK0+cyNfL3UjrfTyLyzlA8yoQf3UPhdzbGdbCC8APzpc/gprGLa5CE/MS9oicl9G/WcEWp8tiwJwCyLQjF+ARA==;25:/eQ/znD6/SaxxUj50hL69foWB6M4d6Thb9AINzLiGt7k0y7IEN+0TUI9uTx5cB10wv44w+4AiIrDMqCUTzEsnDK+Zb3Nq5poanf3KI1SJmWgyPG8dHHD8kinZZaX6z/82cjSrM90zRWclaZTH30piDJvNd4FVwwecJislYc5s4Tgn460X9MPjLxUJaSoorx69rVvgpbJT+E9kEbEKkji7TGf2jlBNjQddemqRhTgZElyNKurQiHPkgcmLJekoZSraOS/IhEP5BeD6samL5iLPOaIS5P5NsQb/3ty+dDw5+VccJvzBg47Riu9CfOHMVOygza0HJKLNr23Hlh/fEHMr0DNOOYT1fMmQfFMdPyWTTiXQcE/rM93paD+hzTb4tjUYm3YCNwp5AqV8I12aFzQ9azbf6xbP8qVkwQPY4/Khm4= X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(8251501002);SRVR:BY2PR02MB521; X-Microsoft-Exchange-Diagnostics: 1;BY2PR02MB521;20: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;4:S1nO/5NMxJtmnBzMmgFrNs5Id2k2+B0iJT5GpLTapeeZWLy3WiFD2O37kwpAavMWSK/f6hTa7yX44nmOuTjshONrOkwjeBJqpEndY4Z+abRqkqi5FKZ5AlA3eV6DSNr9yzJRrhFLIH5Zjmw7eDjcbWr7CcfA0twplh/cz/hP3JWv+eWqsd3qeFnQbLaS4TIdzWtfLBV/EIidiodqzfx78yyy8OHVVm01sQh2FkMH4nHmMj/deMU8g8ymZN970JDISUY1H6xKxzub9sqsQH5oN6sGyOW/NyzNLbLsHbx/asTz7lk3PRGLhnN1k/e5JZBJ6/JdTDQEVZ68YB8aJwK8XVnk+Fekbleew0YneX12escJmYCyESEjg3/Qc4dSh+hwqedWsZ+pYsROplZDXgutr36WJx+rf5WciXoHZy1NyYw= X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(601004)(2401047)(13016025)(13018025)(8121501046)(5005006)(3002001)(10201501046)(6055026);SRVR:BY2PR02MB521;BCL:0;PCL:0;RULEID:;SRVR:BY2PR02MB521; X-Forefront-PRVS: 09749A275C X-Microsoft-Exchange-Diagnostics: =?utf-8?B?MTtCWTJQUjAyTUI1MjE7MjM6WnJoemhqbndySmxCWjhaclY0d2JROThIMnkr?= =?utf-8?B?TGhaUzZGcEh2VXRoaWhNc0VlaVJ1SkJ5ZHJSRTR5dnNNZmpuL1dLN3VSYlBq?= =?utf-8?B?Y3l3QTZRMlA3bkxNZFNzQlA0WTZzc2sra25mZmxqVXZXcEljTXRNdGo0ejYx?= =?utf-8?B?YlMzUjlvclFrNzJlbk04b3Q3eDYrSnVrb1JrWkltYUNTWmhZL0V3QWZsbDBn?= =?utf-8?B?YkNJelY5SW1YaXhTOFpiSEtYNDdsS2l3OE9KTll5aVlOYjAvM1ZzM0RsOEYy?= =?utf-8?B?aVZGVkJiWFVhOXlqS1NlK0tlQzZwM00ybzF1TU9GSXV4RHI0eDJGS2IzTFZP?= =?utf-8?B?Q3hqZng1UDg4ZzU0WUswak5ZVzlERnRGK1NWbEh5UlJEYlpsRkpjYXZicGJu?= =?utf-8?B?eExkRzFuWWh5RWllUXg4OFVIZkdOd3p4T0s5Q0x1QnhCZFRuZXAwMjEvOFUz?= =?utf-8?B?eXJoZEdHNXl1WXM3ZkgrcEJZRFl0R2dzY1pETWxMbEM1Y0JnVnlFQWVXM3RU?= =?utf-8?B?M21jOW9hMU5ocEM5VjlYd2ZLczZZM0VhdkkzejVPNVpkdFRMZUZhVTFTaUwv?= =?utf-8?B?TmRTNjVobW9ySitlVkgvWlU3cmdCTnUwSEh6ZzdWOEd1L1I0UG5mK2FwMi9Y?= =?utf-8?B?REdMQlpnaDd5bDVGZTkvamRDQklIQ2ZZekdxR0p5UHh4WXZ4OTJBNTh4R3Rt?= =?utf-8?B?QmxzOXQ2NDBZTzFDNmI0aTdLTzFvT2xtVXJtaWM3ekdMbWNFbzhkM0cvREcv?= =?utf-8?B?VWNzNGxWQ2ZYOUNWQ01ZVy9GMTJnMFhMWlVHQk9WL212L3JVVWxwSm0wWXhz?= =?utf-8?B?N2hEKzMwYzY0eVdZM3hveWZoQkk4c1pIbWxjS1FzZEY0dGNOajdTL1NzR05C?= =?utf-8?B?WkZKVlBBMHE3MEdtSTUxWWR0ZEVzamk3aHRTTWpPclRCRG9GeXlCMzBEaDJJ?= =?utf-8?B?TlluTXJFb0hFZkgwS0wrZmRScjRRQnY1cXdIdUNaVmdSZzk0eDNEdGdudSs4?= =?utf-8?B?NDdWTEw1MXRUd2Zxc2ZSNmRMMmErRkVLSTVGcmdQNVpxWWkzUE9NcGNkT3VF?= =?utf-8?B?cVQ5L0tKQURPSXFQYjNTS0VNQ1drdUU5citrNSt4eVNJcGFEREJWdDN2TlhM?= =?utf-8?B?S0dEdVNraXJTMys3b2I3NU1jTDVSQ0Y0MjJ5b0wxeWpkaW52QW8xRVhGQXlj?= =?utf-8?B?YThZY1kySEVEOVoyTzh5ckh2cFU1dVFZT3kxZ3lvV2crTEVRYjlVaUhzNk9u?= =?utf-8?B?VXQ0SHJQUmhIbTFMbGJFTHB3cDB4KzVZU0kxTVJ6NC96Sk1NRVN5bU9zUVAx?= =?utf-8?B?QUtXbUlKTmdEalFMazRoQVZBR3JxdUtoN05JSi9DcVY2ZkZQTDdJMWVqemZP?= =?utf-8?B?N09mMW9oUUM0N2NkQzd4VXEzL3g0b1luVE1jZ21DV2owNXBMUzE2SXlPa1hz?= =?utf-8?B?Wld5ZlJ2N3pVVCt6c3lWdkNVSGh0TEg0WHF6VVUyQkNPYWJPeVJCcWRjbWxs?= =?utf-8?B?RSs1azBrN3owWjBGS3dNeHV1NWpmQit4d0NCUm01Y0I0bVNCRnJHaUxMZ3N5?= =?utf-8?B?QmFVRWwvdW9yWXZoT1hhc0RXaGhuSjRHbVg4YjRXZ1E1TThreFIxOVpUTWtZ?= =?utf-8?B?QVhSVTlwajBZa1IxbW1zM3dNZHZCdXJ3UDF1VG90bWRGSDl4QWVFbU1nYWpD?= =?utf-8?Q?uVicLw9pZTwQ1RYkNz3Bwpjoqlko6CGeehA+8D?= X-Microsoft-Exchange-Diagnostics: 1;BY2PR02MB521;5:SZyAhpQS3B1yK12wLhkqid3dk/9Z6SpK38r1qOQUFhAUCigt3zP0p8v2A0c8Lrsycb67x/WlPRdcXklISGAmRoICxq7HQqFp3WsYhi5ZifPWzIISfw5B0r7K5HIqRstViC4mOWEQMXa94Lt/ge1kWw==;24:MD8MongmiIC6gNETIyBRjnLIJNX0LALTLx0Ps9uWLZuFXOHo5g2bZ3tnbX1iUmWw/5boZziclc9GFvCVo+NYjiiUpfxdpW/hM+UNqKn4phM=;7:tkOIzo/40kRrL1l0SpCkf/IBIVuZ9U5r+C27mFFpPNCLAqyU2L1VcgPTqKs9z0iWmhxcRwxQW93X2pnoas/9JNDXI+3r9hYs4P8xLf85RiluiB3k9Rp8C9LnXwhCnMkXbdrgSgQaBR4XS1kRSJRwLmHKzPrN32N8bogQh637UhRsOyRFtdQ/D9mzR9sXlDrs7FymF+HF1LZ8s5CtyxZSSQ==;20:f7A6OSeIqj7Qrybj8z9rE00P/im8mmon+aCzssAjVPoF9xpIAZeGGPu8/HCw82NZ5VfhIwoFUoYlR215AV9dv8KwWMwNGY1C508NsBc5Bm2aeKyAZT3SCNwc1NI/UBsjs6f08GUHlVZOv59z+50ySXtX3kogPQz8/QeMWr6nGi3cJO+eTtIVsJNVbmCV/PnPtV7RkrdInZEV5SRC0mHoPia92L9wVyJv6tIBn/OrVSQ4LNcNxQEFbXr6TKPquVTY SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: sandisk.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2016 15:29:05.8943 (UTC) X-MS-Exchange-CrossTenant-Id: fcd9ea9c-ae8c-460c-ab3c-3db42d7ac64d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=fcd9ea9c-ae8c-460c-ab3c-3db42d7ac64d;Ip=[63.163.107.21];Helo=[milsmgep15.sandisk.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR02MB521 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/15/2016 05:14 PM, Keith Busch wrote: > On Wed, Jun 15, 2016 at 12:42:53PM +0200, Bart Van Assche wrote: >> If two identical adapters are present in a system, will these generate the >> same irq_affinity mask? Do you agree that interrupt vectors from different >> adapters should be assigned to different CPU cores if enough CPU cores are >> available? If so, which software layer will assign interrupt vectors from >> different adapters to different CPU cores? > > I think the idea is have the irq_affinity mask match the CPU mapping on > the submission side context associated with that particular vector. If > two identical adapters generate the same submission CPU mapping, I don't > think we can do better than matching irq_affinity masks. Has this been verified by measurements? Sorry but I'm not convinced that using the same mapping for multiple identical adapters instead of spreading interrupts will result in better performance. Bart.