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

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Message-ID: <aee2ea3b-bd3f-7273-13dc-a0c231021421@mailbox.org>
Date:   Wed, 1 Sep 2021 17:59:06 +0000
From:   Tor Vic <torvic9@...lbox.org>
To:     Hans de Goede <hdegoede@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hpa@...hat.com" <hpa@...hat.com>
Cc:     "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "damien.lemoal@....com" <damien.lemoal@....com>
Subject: Re: [PATCH v4] libata: Add ATA_HORKAGE_NO_NCQ_ON_AMD for Samsung 860
 and 870 SSD.



On 01.09.21 09:38, Hans de Goede wrote:
> Hi,
> 
> On 9/1/21 10:55 AM, Hans de Goede wrote:
>> Hi Tor,
>>
>> On 9/1/21 9:37 AM, torvic9@...lbox.org wrote:
>>> (Sorry for not doing a proper reply)
>>>
>>> Hello,
>>> Noob here.
>>> I have a Samsung 860 Pro connected to a AMD X570 chipset mainboard and
>>> it just works flawlessly on 5.13 and 5.14.
>>> Are you sure that *every* 860/870 is concerned by this problem on
>>> *every* AMD controller?
>>
>> I am pretty sure that every 860 / 870 EVO is affected,
>> I am not sure if the PRO is also affected.
> 
> So while reading https://bugzilla.kernel.org/show_bug.cgi?id=201693
> again to add a comment asking if anyone was seeing this on a
> pro to I found existing comments of both queued-trims being
> an issue on the 860 pro, as well as the 860 pro having issues
> with some AMD sata controllers.
> 
> So it seems safe to say that the 860 pro has the same issues
> as the 860 and 870 evo models. Chances are you don't have
> discard support enabled causing you to not see the queued-trim
> issues (which means you also won't see any difference from
> disabling support for queued-trim commands).
> 
> So this just leaves your question of:
> 
> "concerned by this problem on *every* AMD controller?"
> 
> Where "this problem" is needing to completely disable NCQ
> and I guess the answer is no, not every AMD controller
> is affected. Still the plan is to err on the safe side for now,
> allowing overriding this from the kernel cmdline with:
> 
> libata.force=ncqamd
> 
> I will add a comment to:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=201693
> 
> Asking for PCI-ids of the controllers where people are seeing
> this and then maybe we can narrow down the "AMD" check in a
> future follow up patch.

$ lspci -nn | grep -i sata


06:00.0 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] FCH
SATA Controller [AHCI mode] [1022:7901] (rev 51)
07:00.0 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] FCH
SATA Controller [AHCI mode] [1022:7901] (rev 51)

Both Samsung 860 Pro and 860 Evo are connected to these.

> 
> Regards,
> 
> Hans
>