Re: [PATCH v1 02/12] xprtrdma: Raise maximum payload size to one megabyte

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Looks good

Reviewed-By: Devesh Sharma <devesh.sharma@xxxxxxxxxxxxx>

On Fri, Jul 10, 2015 at 2:11 AM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
> The point of larger rsize and wsize is to reduce the per-byte cost
> of memory registration and deregistration. Modern HCAs can typically
> handle a megabyte or more with a single registration operation.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
>  net/sunrpc/xprtrdma/xprt_rdma.h |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
> index f49dd8b..abee472 100644
> --- a/net/sunrpc/xprtrdma/xprt_rdma.h
> +++ b/net/sunrpc/xprtrdma/xprt_rdma.h
> @@ -165,8 +165,7 @@ rdmab_to_msg(struct rpcrdma_regbuf *rb)
>   * struct rpcrdma_buffer. N is the max number of outstanding requests.
>   */
>
> -/* temporary static scatter/gather max */
> -#define RPCRDMA_MAX_DATA_SEGS  (64)    /* max scatter/gather */
> +#define RPCRDMA_MAX_DATA_SEGS  ((1 * 1024 * 1024) / PAGE_SIZE)
>  #define RPCRDMA_MAX_SEGS       (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
>
>  struct rpcrdma_buffer;
>
> --
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