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Wed, 16 Sep 2020 12:08:55 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::cdbe:f274:ad65:9a78]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::cdbe:f274:ad65:9a78%7]) with mapi id 15.20.3391.011; Wed, 16 Sep 2020 12:08:55 +0000 Date: Wed, 16 Sep 2020 09:08:52 -0300 From: Jason Gunthorpe To: Will Deacon CC: Benjamin Herrenschmidt , Lorenzo Pieralisi , Clint Sbisa , , Bjorn Helgaas , , , "Leon Romanovsky" Subject: Re: [PATCH] arm64: Enable PCI write-combine resources under sysfs Message-ID: <20200916120852.GM1573713@nvidia.com> References: <20200914143819.GC904879@nvidia.com> <375c478593945a416f3180c3773bcb5240d2e36c.camel@kernel.crashing.org> <1d6f2ceb8d3538c906a1fdb8cd3d4c74ccffa42e.camel@kernel.crashing.org> <20200914225740.GP904879@nvidia.com> <2b539df4c9ec703458e46da2fc879ee3b310b31c.camel@kernel.crashing.org> <20200915101831.GA2616@e121166-lin.cambridge.arm.com> <20200915110511.GQ904879@nvidia.com> <20200915234006.GI1573713@nvidia.com> <20200916083315.GC27496@willie-the-truck> Content-Type: text/plain; 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a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1600258089; bh=OKT/7wd52TGL0Hy6cEMxNeaCObdkvqppqEl1m4B9x5I=; h=X-PGP-Universal:ARC-Seal:ARC-Message-Signature: ARC-Authentication-Results:Authentication-Results:Date:From:To:CC: Subject:Message-ID:References:Content-Type:Content-Disposition: In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType:X-Originating-IP: X-MS-PublicTrafficType:X-MS-Office365-Filtering-Correlation-Id: X-MS-TrafficTypeDiagnostic:X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers:X-MS-Exchange-SenderADCheck: X-Microsoft-Antispam:X-Microsoft-Antispam-Message-Info: X-Forefront-Antispam-Report:X-MS-Exchange-AntiSpam-MessageData: X-MS-Exchange-CrossTenant-Network-Message-Id: X-MS-Exchange-CrossTenant-AuthSource: X-MS-Exchange-CrossTenant-AuthAs: X-MS-Exchange-CrossTenant-OriginalArrivalTime: X-MS-Exchange-CrossTenant-FromEntityHeader: X-MS-Exchange-CrossTenant-Id:X-MS-Exchange-CrossTenant-MailboxType: X-MS-Exchange-CrossTenant-UserPrincipalName: X-MS-Exchange-Transport-CrossTenantHeadersStamped:X-OriginatorOrg; b=bv6gR2gDiVMVgpqFNij90SWGZkeS3hMaM957c3QXA19qg+RXb4/WCnoQw5DAupkWt m8SY0Csl47By93AHHkIDqO6X1XnCQjsRU3z0DGVj95JYuMtwLY9a6x81StVuL4MqGW YQTm6ZdctH8j9tx77ILKof5izsl9j4iN14wZtXxNyLtPqTgI/l2ufHzvNbTIA9rR1J fL3S9N2hXF8MDhSdJycyuLPVrbKS9fqLf9yoM4m8qtOWVpVOMkAw0+Zg1zDP42G+8v SOJw+uLQbaLhKYi18MHMegRpU2k13PMBNBymYF/UTpjSi2d2FZ6EbPHN1EPuLY7m9a J9nxRj2TgJN1A== Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Wed, Sep 16, 2020 at 09:33:16AM +0100, Will Deacon wrote: > Is that just TX2? I remember that thing being weird where GRE performed > better than NC, but I thought that was a one off (and the thing is dead). It is at least TX2, yes, but it is not really dead, someone made a respectable supercomputer out of them that still has an operational life ahead of it. Jason