linux-kernel - Re: [PATCH] nvme-pci: Add sleep quirk for Samsung 990 Evo

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Message-ID: <f7a70add-4d65-40a4-91ff-70bc14a64467@tuxedocomputers.com>
Date: Wed, 3 Apr 2024 11:24:39 +0200
From: Georg Gottleuber <g.gottleuber@...edocomputers.com>
To: Keith Busch <kbusch@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Werner Sembach <wse@...edocomputers.com>,
 Jens Axboe <axboe@...nel.dk>, Sagi Grimberg <sagi@...mberg.me>,
 Georg Gottleuber <ggo@...edocomputers.com>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme-pci: Add sleep quirk for Samsung 990 Evo

Am 02.04.24 um 18:08 schrieb Keith Busch:
> On Tue, Apr 02, 2024 at 05:13:48PM +0200, Georg Gottleuber wrote:
>> Am 02.04.24 um 15:16 schrieb Christoph Hellwig:
>>> On Thu, Mar 28, 2024 at 02:09:22PM +0100, Werner Sembach wrote:
>>>> From: Georg Gottleuber <ggo@...edocomputers.com>
>>>>
>>>> On some TUXEDO platforms, a Samsung 990 Evo NVMe leads to a high
>>>> power consumption in s2idle sleep (2-3 watts).
>>>>
>>>> This patch applies 'Force No Simple Suspend' quirk to achieve a
>>>> sleep with a lower power consumption, typically around 0.5 watts.
>>>
>>> Does this only apply to a specific SSD or all SSDs on this platform?
>>> How do these platforms even get into the conditional?  Probably
>>> through acpi_storage_d3 setting, which probably is set incorrectly
>>> for the platform?  Any chance to just fix that?
>>
>> Yes, this only apply to a specific SSD. I tested these SSDs (on
>> PH4PRX1_PH6PRX1):
>> * Kingston NV1, SNVS250G
>> * Samsung 980, MZ-V8V500
>> * Samsung 970 Evo, S46DNX0K900454D
>> * Samsung 980 Pro, S69ENX0T709932L
>>
>> S2idle consumes around 0.4 watts with these SSDs. But with a Samsung 990 Evo
>> s2idle on this platform consumes 3.7 to 4.4 watts (6.8 vs 6.5 kernel).
> 
> For all these different SSDs you tested in this platform, do you see the
> "platform quirk: setting simple suspend" in the dmesg? I just want to
> confirm if the platform is changing the reported acpi_storage_d3 value
> for different SSD models or if they're all the same.

Yes, without my quirk for all tested SSDs (including Samsung 990 Evo) 
"platform quirk: setting simple suspend" is printed in dmesg.