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To: Kate Hsuan , Hans de Goede , Damien Le Moal Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210903094411.58749-1-hpa@redhat.com> From: Jens Axboe Message-ID: Date: Fri, 3 Sep 2021 06:35:12 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210903094411.58749-1-hpa@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/3/21 3:44 AM, Kate Hsuan wrote: > Many users are reporting that the Samsung 860 and 870 SSD are having > various issues when combined with AMD/ATI (vendor ID 0x1002) SATA > controllers and only completely disabling NCQ helps to avoid these > issues. > > Always disabling NCQ for Samsung 860/870 SSDs regardless of the host > SATA adapter vendor will cause I/O performance degradation with well > behaved adapters. To limit the performance impact to ATI adapters, > introduce the ATA_HORKAGE_NO_NCQ_ON_ATI flag to force disable NCQ > only for these adapters. > > Also, two libata.force parameters (noncqati and ncqati) are introduced > to disable and enable the NCQ for the system which equipped with ATI > SATA adapter and Samsung 860 and 870 SSDs. The user can determine NCQ > function to be enabled or disabled according to the demand. > > After verifying the chipset from the user reports, the issue appears > on AMD/ATI SB7x0/SB8x0/SB9x0 SATA Controllers and does not appear on > recent AMD SATA adapters. The vendor ID of ATI should be 0x1002. > Therefore, ATA_HORKAGE_NO_NCQ_ON_AMD was modified to > ATA_HORKAGE_NO_NCQ_ON_ATI. What's this patch against? -- Jens Axboe