linux-kernel - RE: nvme-pci: disable write zeros support on SSDs

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Date:   Thu, 22 Sep 2022 05:50:52 +0000
From:   Rita Lin <ritach_lin@...son.com>
To:     Christoph Hellwig <hch@....de>
CC:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        �S晟�| <redd_huang@...son.com>,
        Tina Hsu <tina_hsu@...son.com>,
        Vita Hsueh (薛伊倩) <Vita.Hsueh@...ntatw.com>,
        "Wang, Audrey" <audrey.wang@...com>
Subject: RE: nvme-pci: disable write zeros support on SSDs

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 Lin林萁煊
+886-37-586-896 Ext.80051
ritach_lin@...son.com

-----Original Message-----
From: Christoph Hellwig [mailto:hch@....de]
Sent: Thursday, September 22, 2022 1:32 PM
To: Rita Lin <ritach_lin@...son.com>
Cc: Keith Busch <kbusch@...nel.org>; Jens Axboe <axboe@...com>; Christoph Hellwig <hch@....de>; Sagi Grimberg <sagi@...mberg.me>; linux-nvme@...ts.infradead.org; linux-kernel@...r.kernel.org; �S晟�| <redd_huang@...son.com>; Tina Hsu <tina_hsu@...son.com>; Vita Hsueh (薛伊倩) <Vita.Hsueh@...ntatw.com>; Wang, Audrey <audrey.wang@...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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