On Tue, Jul 22, 2014 at 05:48:04PM -0400, Chuck Lever wrote:
> The RDMA credit limit controls how many concurrent RPCs are allowed
> per connection.
>
> An NFS/RDMA client and server exchange their credit limits in the
> RPC/RDMA headers. The Linux client and the Solaris client and server
> allow 32 credits. The Linux server allows only 16, which limits its
> performance.
>
> Set the server's default credit limit to 32, like the other well-
> known implementations, so the out-of-the-shrinkwrap performance of
> the Linux server is better.
Thanks, applying for 3.17.--b.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
>
> include/linux/sunrpc/svc_rdma.h | 3 +--
> 1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
> index 5cf99a0..975da75 100644
> --- a/include/linux/sunrpc/svc_rdma.h
> +++ b/include/linux/sunrpc/svc_rdma.h
> @@ -174,8 +174,7 @@ struct svcxprt_rdma {
> * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */
> #define RPCRDMA_ORD (64/4)
> #define RPCRDMA_SQ_DEPTH_MULT 8
> -#define RPCRDMA_MAX_THREADS 16
> -#define RPCRDMA_MAX_REQUESTS 16
> +#define RPCRDMA_MAX_REQUESTS 32
> #define RPCRDMA_MAX_REQ_SIZE 4096
>
> /* svc_rdma_marshal.c */
>
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