Re: [PATCH v1 09/20] xprtrdma: Limit the number of rpcrdma_mws

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On 6/8/16, 13:40, "Jason Gunthorpe" <jgunthorpe@xxxxxxxxxxxxxxxxxxxx> wrote:

>On Wed, Jun 08, 2016 at 03:06:56PM +0000, Trond Myklebust wrote:
>
>>    That would be a mount parameter which would only apply to RDMA since
>>    everything else uses dynamic slot allocation these days. Iâd prefer to
>>    avoid that.
>
>The only reason RDMA cannot allocate MRs on the fly is
>performance.. Maybe a dynamic scheme is the right answer..
>

It should be easy to do for NFSv4.x (x>0), where the NFS protocol already manages the number of slots. The RPC layer could be notified when it is OK to retire slots that are no longer in use.



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