linux-kernel - Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

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Message-Id: <39EC5974-AD83-411F-8494-70EC79DBB7ED@canonical.com>
Date:   Tue, 21 Apr 2020 12:51:43 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Cc:     "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        linux-stable <stable@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix
 SC300



> On Apr 18, 2020, at 03:25, Chaitanya Kulkarni <Chaitanya.Kulkarni@....com> wrote:
> 
> On 04/17/2020 01:37 AM, Kai-Heng Feng wrote:
>> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
>> command"), SK hynix SC300 becomes very slow with the following error
>> message:
>> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
>> 
>> Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.
> Can you share
> nvme id-ctrl -H /dev/nvme0 | grep oncs -A 8
> output?
> 

$ sudo nvme id-ctrl -H /dev/nvme0 | grep oncs -A 8
oncs      : 0x1f
  [7:7] : 0     Verify Not Supported
  [6:6] : 0     Timestamp Not Supported
  [5:5] : 0     Reservations Not Supported
  [4:4] : 0x1   Save and Select Supported
  [3:3] : 0x1   Write Zeroes Supported
  [2:2] : 0x1   Data Set Management Supported
  [1:1] : 0x1   Write Uncorrectable Supported
  [0:0] : 0x1   Compare Supported