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
Hi,
On 9/3/21 2:35 PM, Jens Axboe wrote:
> 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?
linux-block/for-next + my pre-cursor patch from here:
https://lore.kernel.org/linux-ide/[email protected]/T/#u
Regards,
Hans