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From: Jens Axboe <>
To: Hans de Goede <>, Kate Hsuan <>,
	Damien Le Moal <>
Subject: Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD.
Date: Fri, 3 Sep 2021 08:05:54 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 9/3/21 8:03 AM, Hans de Goede wrote:
> 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
>> What's this patch against?
> linux-block/for-next + my pre-cursor patch from here:

Still had to fixup a hunk, but it was trivial. In any case, I've applied
both now, thanks!

Jens Axboe

  reply	other threads:[~2021-09-03 14:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-03  9:44 Kate Hsuan
2021-09-03 10:03 ` Hans de Goede
2021-09-03 12:35 ` Jens Axboe
2021-09-03 14:03   ` Hans de Goede
2021-09-03 14:05     ` Jens Axboe [this message]
2021-09-03 13:08 ` Martin K. Petersen

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