From 864be126fe5f325ec4b3e28173ca5cad2b8ee28c Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 3 Aug 2015 13:02:50 -0400 Subject: [PATCH] xprtrdma: Raise maximum payload size to one megabyte 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 Reviewed-by: Devesh Sharma Reviewed-By: Sagi Grimberg Tested-by: Devesh Sharma Signed-off-by: Anna Schumaker --- 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; -- 2.7.4