Return-Path: Received: from mail-it0-f65.google.com ([209.85.214.65]:34178 "EHLO mail-it0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754500AbcHWRyq (ORCPT ); Tue, 23 Aug 2016 13:54:46 -0400 Subject: [PATCH v2 19/22] xprtrdma: Support larger inline thresholds From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 23 Aug 2016 13:54:38 -0400 Message-ID: <20160823175438.13038.1624.stgit@manet.1015granger.net> In-Reply-To: <20160823174402.13038.84561.stgit@manet.1015granger.net> References: <20160823174402.13038.84561.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: RPC-over-RDMA Version Two will likely require at least a 4KB inline threshold by default. The Version One inline threshold is still 1KB, and it's automatically negotiated down to in rpcrdma_update_connect_private. The maximum is somewhat arbitrary. There's no fundamental architectural limit I'm aware of, but it's good to keep the size of Receive buffers reasonable. Now that Send can use a s/g list, a Send buffer is only as large as each RPC requires. Receive buffers are always the size of the inline threshold, however. Signed-off-by: Chuck Lever --- include/linux/sunrpc/xprtrdma.h | 4 ++-- net/sunrpc/xprtrdma/transport.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h index 39267dc..221b7a2 100644 --- a/include/linux/sunrpc/xprtrdma.h +++ b/include/linux/sunrpc/xprtrdma.h @@ -53,8 +53,8 @@ #define RPCRDMA_MAX_SLOT_TABLE (256U) #define RPCRDMA_MIN_INLINE (1024) /* min inline thresh */ -#define RPCRDMA_DEF_INLINE (1024) /* default inline thresh */ -#define RPCRDMA_MAX_INLINE (3068) /* max inline thresh */ +#define RPCRDMA_DEF_INLINE (4096) /* default inline thresh */ +#define RPCRDMA_MAX_INLINE (65536) /* max inline thresh */ /* Memory registration strategies, by number. * This is part of a kernel / user space API. Do not remove. */ diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index 6a358ab..ed5e285 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = { .data = &xprt_rdma_max_inline_read, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, }, @@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = { .data = &xprt_rdma_max_inline_write, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, },