Re: [PATCH 00/20] NFSD support for multiple RPC/RDMA chunks

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> On Oct 28, 2020, at 3:16 AM, Leon Romanovsky <leon@xxxxxxxxxx> wrote:
> 
> On Tue, Oct 27, 2020 at 09:24:54AM -0400, Chuck Lever wrote:
>> Hi Leon-
>> 
>>> On Oct 27, 2020, at 2:08 AM, Leon Romanovsky <leon@xxxxxxxxxx> wrote:
>>> 
>>> On Mon, Oct 26, 2020 at 02:53:53PM -0400, Chuck Lever wrote:
>>>> This series implements support for multiple RPC/RDMA chunks per RPC
>>>> transaction. This is one of the few remaining generalities that the
>>>> Linux NFS/RDMA server implementation lacks.
>>>> 
>>>> There is currently one known NFS/RDMA client implementation that can
>>>> send multiple chunks per RPC, and that is Solaris. Multiple chunks
>>>> are rare enough that the Linux NFS/RDMA implementation has been
>>>> successful without this support for many years.
>>> 
>>> So why do we need it? Solaris is dead, and like you wrote Linux systems
>>> work without this feature just fine, what are the benefits? Who will use it?
>> 
>> The Linux NFS implementation is living. We can add the ability
>> to provision multiple chunks per RPC to the Linux NFS client at
>> any time.
>> 
>> Likewise any actively developed NFS/RDMA implementation can add
>> this feature. The RPC/RDMA version 1 protocol does not have the
>> ability to communicate the maximum number of chunks the server
>> will accept per RPC.
>> 
>> Other server implementations do support multiple chunks per RPC.
>> The Linux NFS/RDMA server implementation has always been incomplete
>> in this regard.
>> 
>> And the Linux NFS server implementation (the non-transport specific
>> part) already supports multiple data payloads per NFSv4 COMPOUND.
> 
> Thanks, I just got different feeling then I read the cover letter.
> You presented it like no one needs this feature.

Understood. I'll incorporate a summary of the content of this thread
in the cover letter for the next version of the series.

--
Chuck Lever







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