archive mirror
 help / color / mirror / Atom feed
From: Jens Axboe <>
To: Kate Hsuan <>, Hans de Goede <>,
	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 06:35:12 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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?

Jens Axboe

  parent reply	other threads:[~2021-09-03 12:35 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 [this message]
2021-09-03 14:03   ` Hans de Goede
2021-09-03 14:05     ` Jens Axboe
2021-09-03 13:08 ` Martin K. Petersen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \
    --subject='Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD.' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).