linux-kernel - Re: [PATCH v4] libata: Add ATA_HORKAGE_NO_NCQ_ON

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Message-ID: <YS8egQU7RVhc6Uwk@infradead.org>
Date:   Wed, 1 Sep 2021 07:32:33 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Kate Hsuan <hpa@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Hans de Goede <hdegoede@...hat.com>,
        Damien Le Moal <damien.lemoal@....com>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] libata: Add ATA_HORKAGE_NO_NCQ_ON_AMD for Samsung 860
 and 870 SSD.

On Wed, Sep 01, 2021 at 12:52:20PM +0800, Kate Hsuan wrote:
> Many users are reporting that the Samsung 860 and 870 SSD are having
> various issues when combined with AMD 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 AMD adapters,
> introduce the ATA_HORKAGE_NO_NCQ_ON_AMD flag to force disable NCQ
> only for these adapters.
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=201693
> Signed-off-by: Kate Hsuan <hpa@...hat.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>