nvme-pci: disable write zeros support on SSDs

[Rita Lin]

Dear Christoph,

Thank you for your reply.
These SSDs do support write 0 command and the function was tested without issue.
But since these SSDs are DRAMless products, the write 0 command will take a lot longer to complete which had impacted the product performance.
Due to the FW had been frozen, we would like to check if we could apply CL for these 2 products.

Rita LinÁÖݽìÓ
+886-37-586-896 Ext.80051
ritach_lin at phison.com


-----Original Message-----
From: Christoph Hellwig [mailto:hch at lst.de]
Sent: Thursday, September 22, 2022 1:32 PM
To: Rita Lin <ritach_lin at phison.com>
Cc: Keith Busch <kbusch at kernel.org>; Jens Axboe <axboe at fb.com>; Christoph Hellwig <hch at lst.de>; Sagi Grimberg <sagi at grimberg.me>; linux-nvme at lists.infradead.org; linux-kernel at vger.kernel.org; üSêɬ| <redd_huang at phison.com>; Tina Hsu <tina_hsu at phison.com>; Vita Hsueh (ѦÒÁÙ») <Vita.Hsueh at quantatw.com>; Wang, Audrey <audrey.wang at hp.com>
Subject: Re: nvme-pci: disable write zeros support on SSDs

On Thu, Sep 22, 2022 at 02:03:01AM +0000, Rita Lin wrote:
> Dear receivers,
>
> We would like to apply to disable write zeros support on Phison SSDs.

Can you explain why these SSDs do claim write Zeroes but it doesn't actually work, and why this is not fixable in a firmware update?


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