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Re: [PATCH v1] block/nvme: introduce PMR support from NVMe 1.4 spec
From: |
Andrzej Jakowski |
Subject: |
Re: [PATCH v1] block/nvme: introduce PMR support from NVMe 1.4 spec |
Date: |
Fri, 21 Feb 2020 13:20:30 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 |
On 2/21/20 12:32 PM, Stefan Hajnoczi wrote:
> Hi Andrzej,
> After having looked at the PMRWBM part of the spec, I think that the
> Bit 1 mode should be implemented for slightly better performance. Bit
> 0 mode is not well-suited to virtualization for the reasons I
> mentioned in the previous email.
>
> The spec describes Bit 1 mode as "The completion of a read to the
> PMRSTS register shall ensure that all prior writes to the Persistent
> Memory Region have completed and are persistent".
>
> Stefan
Make sense -- will incorporate that feedback in second version of patch.
Re: [PATCH v1] block/nvme: introduce PMR support from NVMe 1.4 spec, Dr. David Alan Gilbert, 2020/02/21