linux-kernel - Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON

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Message-ID: <d3488035-d269-2a63-f958-746f371cf490@kernel.dk>
Date:   Fri, 3 Sep 2021 06:35:12 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Kate Hsuan <hpa@...hat.com>, Hans de Goede <hdegoede@...hat.com>,
        Damien Le Moal <damien.lemoal@....com>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860
 and 870 SSD.

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