Re: [PATCH v1] svcrdma: Increase the server's default RPC/RDMA credit grant

[Mike Snitzer <snitzer@kernel.org>]

On Fri, Sep 26, 2025 at 11:52:35AM -0400, Chuck Lever wrote:
> From: Chuck Lever <chuck.lever@oracle.com>
> 
> Now that the nfsd thread count can scale to more threads, permit

Just trying to appreciate which change(s) paved the way for this
RPCRDMA_MAX_REQUESTS change.

Are you referring to the netlink interface changes Jeff did earlier
this year or something else? (thinking "something else" but...)

Might be useful to update the header to convey which specific
commit(s) made this change possible.

Mike

> individual clients to make more use of those threads. Increase the
> RPC/RDMA per-connection credit grant from 64 to 128 -- same as the
> Linux NFS client.
> 
> Simple single client fio-based benchmarking so far shows only
> improvement, no regression.
> 
> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
> ---
>  include/linux/sunrpc/svc_rdma.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
> index 22704c2e5b9b..57f4fd94166a 100644
> --- a/include/linux/sunrpc/svc_rdma.h
> +++ b/include/linux/sunrpc/svc_rdma.h
> @@ -131,7 +131,7 @@ static inline struct svcxprt_rdma *svc_rdma_rqst_rdma(struct svc_rqst *rqstp)
>   */
>  enum {
>  	RPCRDMA_LISTEN_BACKLOG	= 10,
> -	RPCRDMA_MAX_REQUESTS	= 64,
> +	RPCRDMA_MAX_REQUESTS	= 128,
>  	RPCRDMA_MAX_BC_REQUESTS	= 2,
>  };
>  
> -- 
> 2.51.0
> 
>