Re: [PATCH v4 2/5] NFSD: Add READ_PLUS data support

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> On Sep 4, 2020, at 12:17 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
> 
> 
> 
>> On Sep 4, 2020, at 11:24 AM, Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
>> 
>> I'm not seeing the RDMA connection, by the way.  SEEK and READ_PLUS
>> should work the same over TCP and RDMA.
> 
> The READ_PLUS result is not DDP-eligible because there's no way for
> the client to predict in advance whether there will be data (which
> can be moved by RDMA), holes or patterns (which cannot), nor how
> many of each there might be.
> 
> Therefore I've asked Anna to leave READ_PLUS disabled on RDMA mounts.

Since this is a public forum, I should clarify that READ_PLUS does
work on NFS/RDMA mounts. It's just not as efficient as NFS READ with
RDMA, and that kind of defeats its purpose as a replacement for NFS
READ in everyday usage.


--
Chuck Lever






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