Re: [PATCH v3 0/1] libata: Add ATA_HORKAGE_NONCQ_ON_AMD for Samsung 860 and 870 SSD.

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 8/30/21 11:45 PM, Damien Le Moal wrote:
> On 2021/08/30 23:43, Kate Hsuan wrote:
>> Many users reported the issue when running the system with Samsung 860,
>> 870 SSD, and AMD chipset. Therefore, completely disabling the NCQ can
>> avoid this issue.
>>
>> Entire disabling NCQ for Samsung 860/870 SSD will cause I/O performance
>> drop. In this case, a flag ATA_HORKAGE_NONCQ_ON_AMD is introduced to
>> used to perform an additional check for these SSDs. If it finds its parent
>> ATA controller is AMD, the NCQ will be disabled. Otherwise, the NCQ is kept
>> to enable.
> 
> For a single patch, generally, a cover letter is not needed. Especially so in
> this case since your cover letter message is the same as the patch commit message.
> 
>>
>> Changes since v3
>> * Modified the flag from ATA_HORKAGE_NONCQ_ON_ASMEDIA_AMD_MARVELL to
>>   ATA_HORKAGE_NONCQ_ON_AMD.
>> * Modified and fixed the code to completely disable NCQ on AMD controller.
> 
> Technically, this is a v2 right ? Also, by "completely", did you mean "always" ?
> (see patch comments).

Right, as mentioned in my reply to the v1 which was accidentally labelled v2
I suggested to just make this v3 to avoid confusion, otherwise we would have
2 v2-s.

Regards,

Hans