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

[Kai-Heng Feng]

> On Apr 17, 2020, at 20:59, Christoph Hellwig <hch@xxxxxx> 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