From f3c1fd0ee294abd4367dfa72d89f016c682202f0 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 1 Oct 2018 14:15:56 -0400 Subject: [PATCH] svcrdma: Reduce max_send_sges There's no need to request a large number of send SGEs because the inline threshold already constrains the number of SGEs per Send. Signed-off-by: Chuck Lever Reviewed-by: Sagi Grimberg Signed-off-by: J. Bruce Fields --- net/sunrpc/xprtrdma/svc_rdma_transport.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 2848cafd4a17..2f7ec8912f49 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -475,10 +475,12 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) /* Qualify the transport resource defaults with the * capabilities of this particular device */ - newxprt->sc_max_send_sges = dev->attrs.max_send_sge; - /* transport hdr, head iovec, one page list entry, tail iovec */ - if (newxprt->sc_max_send_sges < 4) { - pr_err("svcrdma: too few Send SGEs available (%d)\n", + /* Transport header, head iovec, tail iovec */ + newxprt->sc_max_send_sges = 3; + /* Add one SGE per page list entry */ + newxprt->sc_max_send_sges += svcrdma_max_req_size / PAGE_SIZE; + if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) { + pr_err("svcrdma: too few Send SGEs available (%d needed)\n", newxprt->sc_max_send_sges); goto errout; } -- 2.11.0