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

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Date:   Tue, 21 Apr 2020 12:51:18 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-stable <stable@...r.kernel.org>,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.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 17, 2020, at 20:59, Christoph Hellwig <hch@....de> wrote:
> 
> On Fri, Apr 17, 2020 at 04:36:41PM +0800, 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.
> 
> Do you have a written guarantee from SK Hynix that it will always zero
> all blocks discarded?

Raised the issue to SK Hynix and waiting for their reply...

Kai-Heng