linux-ide.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jens Axboe <axboe@kernel.dk>
To: Kate Hsuan <hpa@redhat.com>, Hans de Goede <hdegoede@redhat.com>,
	Damien Le Moal <damien.lemoal@wdc.com>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
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: <d3488035-d269-2a63-f958-746f371cf490@kernel.dk> (raw)
In-Reply-To: <20210903094411.58749-1-hpa@redhat.com>

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


  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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=d3488035-d269-2a63-f958-746f371cf490@kernel.dk \
    --to=axboe@kernel.dk \
    --cc=damien.lemoal@wdc.com \
    --cc=hdegoede@redhat.com \
    --cc=hpa@redhat.com \
    --cc=linux-ide@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD.' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* 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).