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Wed, 14 Apr 2021 15:33:28 +0000 Subject: Re: [PATCH 2/2] iommu/amd: Remove performance counter pre-initialization test To: "Suthikulpanit, Suravee" , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Cc: joro@8bytes.org, will@kernel.org, jsnitsel@redhat.com, pmenzel@molgen.mpg.de, Jon.Grimm@amd.com, Tj , Shuah Khan , Alexander Monakov , Alex Hung <1917203@bugs.launchpad.net> References: <20210409085848.3908-1-suravee.suthikulpanit@amd.com> <20210409085848.3908-3-suravee.suthikulpanit@amd.com> From: David Coe Message-ID: Date: Wed, 14 Apr 2021 16:33:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: Content-Type: multipart/mixed; boundary="------------A58E2D6C58A8E0F63C9E8333" Content-Language: en-GB X-TMN: [otHXh+105Wrzi5jTy/S/exggUlBNqeYa] X-ClientProxiedBy: LO2P265CA0190.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a::34) To VI1PR09MB2638.eurprd09.prod.outlook.com (2603:10a6:803:7b::27) X-Microsoft-Original-Message-ID: <16df2965-369c-b837-2f41-f3adb720b119@live.co.uk> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.0.6] (90.246.218.100) by LO2P265CA0190.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.21 via Frontend Transport; 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charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Hi Suravee! I've re-run your revert+update patch on Ubuntu's latest kernel 5.11.0-14 partly to check my mailer's 'mangling' hadn't also reached the code! There are 3 sets of results in the attachment, all for the Ryzen 2400G. The as-distributed kernel already incorporates your IOMMU RFCv3 patch. A. As-distributed kernel (cold boot) >5 retries, so no IOMMU read/write capability, no amd_iommu events. B. As-distributed kernel (warm boot) <5 retries, amd_iommu running stats show large numbers as before. C. Revert+Update kernel amd_iommu events listed and also show large hit/miss numbers. In due course, I'll load the new (revert+update) kernel on the 4700G but won't overload your mail-box unless something unusual turns up. 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DB3EUR04FT014.mail.protection.outlook.com (2a01:111:e400:7e0c::278) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4042.16 via Frontend Transport; Wed, 14 Apr 2021 15:33:28 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:53F7D76EE2FAFBA312B8E545E6ACAF50263C93ACE7E9A386451E664F811525CD; UpperCasedChecksum:3BAD952E21A21FC0F85CAA53683D71C6EB2FE3E7F53586B2002F50159E3F0286; SizeAsReceived:9187; Count:47 Received: from VI1PR09MB2638.eurprd09.prod.outlook.com ([fe80::948b:987c:566b:198e]) by VI1PR09MB2638.eurprd09.prod.outlook.com ([fe80::948b:987c:566b:198e%5]) with mapi id 15.20.4042.016; Wed, 14 Apr 2021 15:33:28 +0000 Subject: Re: [PATCH 2/2] iommu/amd: Remove performance counter pre-initialization test To: "Suthikulpanit, Suravee" , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org References: <20210409085848.3908-1-suravee.suthikulpanit@amd.com> <20210409085848.3908-3-suravee.suthikulpanit@amd.com> From: David Coe Message-ID: Date: Wed, 14 Apr 2021 16:33:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: Content-Type: multipart/mixed; boundary="------------A58E2D6C58A8E0F63C9E8333" Content-Language: en-GB X-TMN: [otHXh+105Wrzi5jTy/S/exggUlBNqeYa] X-ClientProxiedBy: LO2P265CA0190.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a::34) To VI1PR09MB2638.eurprd09.prod.outlook.com (2603:10a6:803:7b::27) X-Microsoft-Original-Message-ID: <16df2965-369c-b837-2f41-f3adb720b119@live.co.uk> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.0.6] (90.246.218.100) by LO2P265CA0190.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.21 via Frontend Transport; Wed, 14 Apr 2021 15:33:27 +0000 X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 47 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: 006dc61f-a238-4220-d653-08d8ff5aa6a3 X-MS-TrafficTypeDiagnostic: DB3EUR04HT050: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: cZAyEzvcgVMfTPzZWNFVipxP+bqEBHbYBFoY6HmGsDv+Qjcdpe+J57ycybp/4LF81xK1lixImLwyJiUw0aLN4O/bMWqh4P9vKht1gVxc38c0/KVeirW8uhcACk/l6itMdBQg8zjqOHgR1jJasoXh2adhiVSPOwhpil3t+9GXHSygeSg8lz5WZm9QJRVWOcYBEld63d1bomZZPlrP1rZVvhl5zwfI7owDGoRgji4rx3VfoHzTEGrSt+MLjgZlVS44qch6HlsJlEBXUuOutnNzQe6FfzdXBZElIbReFmfsZXp3dZkMhPASuf8rQaHV+qSKY3aN1HHMhgaoVzis1wPV8Dgy4QcN3laeuoYC1rEH6EUDBzv7X/Rnn32KvgQRbt/K X-MS-Exchange-AntiSpam-MessageData: 2wIMjK8VqJSpYQRwNTJWjsH+drEzRAIgilh7lRYk6wpwBwn/tTNISQXIjl8irv5VpsZ35abnhwzDgU4RmQh2/pqFQoOADaiUDTkXyjWbsgnAEZtEwghmyYkiFFlKDDQOOWRlWOfG+F7nYF68qowGgw== X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 006dc61f-a238-4220-d653-08d8ff5aa6a3 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Apr 2021 15:33:28.3608 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-AuthSource: DB3EUR04FT014.eop-eur04.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3EUR04HT050 Cc: pmenzel@molgen.mpg.de, Alexander Monakov , Alex Hung <1917203@bugs.launchpad.net>, Jon.Grimm@amd.com, Shuah Khan , Tj , will@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --------------A58E2D6C58A8E0F63C9E8333 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Hi Suravee! I've re-run your revert+update patch on Ubuntu's latest kernel 5.11.0-14 partly to check my mailer's 'mangling' hadn't also reached the code! There are 3 sets of results in the attachment, all for the Ryzen 2400G. The as-distributed kernel already incorporates your IOMMU RFCv3 patch. A. As-distributed kernel (cold boot) >5 retries, so no IOMMU read/write capability, no amd_iommu events. B. As-distributed kernel (warm boot) <5 retries, amd_iommu running stats show large numbers as before. C. Revert+Update kernel amd_iommu events listed and also show large hit/miss numbers. In due course, I'll load the new (revert+update) kernel on the 4700G but won't overload your mail-box unless something unusual turns up. 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