Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757771Ab2EIGCd (ORCPT ); Wed, 9 May 2012 02:02:33 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:39042 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756445Ab2EIFxl (ORCPT ); Wed, 9 May 2012 01:53:41 -0400 Message-Id: <20120509055038.584464078@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Wed, 09 May 2012 06:51:32 +0100 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Eric Dumazet , Tom Herbert , Nandita Dukkipati , Neal Cardwell , Yuchung Cheng , "H.K. Jerry Chu" , =?ISO-8859-15?q?Maciej=20=C5=BBenczykowski?= , Mahesh Bandewar , =?ISO-8859-15?q?Ilpo=20J=C3=A4rvinen?= , "David S. Miller" Subject: [ 063/167] [PATCH 03/26] tcp: allow splice() to build full TSO packets In-Reply-To: <20120509055029.588587017@decadent.org.uk> X-SA-Exim-Connect-IP: 192.168.4.185 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4584 Lines: 134 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ This combines upstream commit 2f53384424251c06038ae612e56231b96ab610ee and the follow-on bug fix commit 35f9c09fe9c72eb8ca2b8e89a593e1c151f28fc2 ] vmsplice()/splice(pipe, socket) call do_tcp_sendpages() one page at a time, adding at most 4096 bytes to an skb. (assuming PAGE_SIZE=4096) The call to tcp_push() at the end of do_tcp_sendpages() forces an immediate xmit when pipe is not already filled, and tso_fragment() try to split these skb to MSS multiples. 4096 bytes are usually split in a skb with 2 MSS, and a remaining sub-mss skb (assuming MTU=1500) This makes slow start suboptimal because many small frames are sent to qdisc/driver layers instead of big ones (constrained by cwnd and packets in flight of course) In fact, applications using sendmsg() (adding an additional memory copy) instead of vmsplice()/splice()/sendfile() are a bit faster because of this anomaly, especially if serving small files in environments with large initial [c]wnd. Call tcp_push() only if MSG_MORE is not set in the flags parameter. This bit is automatically provided by splice() internals but for the last page, or on all pages if user specified SPLICE_F_MORE splice() flag. In some workloads, this can reduce number of sent logical packets by an order of magnitude, making zero-copy TCP actually faster than one-copy :) Reported-by: Tom Herbert Cc: Nandita Dukkipati Cc: Neal Cardwell Cc: Tom Herbert Cc: Yuchung Cheng Cc: H.K. Jerry Chu Cc: Maciej Żenczykowski Cc: Mahesh Bandewar Cc: Ilpo Järvinen Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- fs/splice.c | 5 ++++- include/linux/socket.h | 2 +- net/ipv4/tcp.c | 2 +- net/socket.c | 6 +++--- 4 files changed, 9 insertions(+), 6 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index fa2defa..6d0dfb8 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -31,6 +31,7 @@ #include #include #include +#include /* * Attempt to steal a page from a pipe buffer. This should perhaps go into @@ -691,7 +692,9 @@ static int pipe_to_sendpage(struct pipe_inode_info *pipe, if (!likely(file->f_op && file->f_op->sendpage)) return -EINVAL; - more = (sd->flags & SPLICE_F_MORE) || sd->len < sd->total_len; + more = (sd->flags & SPLICE_F_MORE) ? MSG_MORE : 0; + if (sd->len < sd->total_len) + more |= MSG_SENDPAGE_NOTLAST; return file->f_op->sendpage(file, buf->page, buf->offset, sd->len, &pos, more); } diff --git a/include/linux/socket.h b/include/linux/socket.h index d0e77f6..ad919e0 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -265,7 +265,7 @@ struct ucred { #define MSG_NOSIGNAL 0x4000 /* Do not generate SIGPIPE */ #define MSG_MORE 0x8000 /* Sender will send more */ #define MSG_WAITFORONE 0x10000 /* recvmmsg(): block until 1+ packets avail */ - +#define MSG_SENDPAGE_NOTLAST 0x20000 /* sendpage() internal : not the last page */ #define MSG_EOF MSG_FIN #define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exit for file diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 34f5db1..36611ab 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -860,7 +860,7 @@ wait_for_memory: } out: - if (copied) + if (copied && !(flags & MSG_SENDPAGE_NOTLAST)) tcp_push(sk, flags, mss_now, tp->nonagle); return copied; diff --git a/net/socket.c b/net/socket.c index 2dce67a..273cbce 100644 --- a/net/socket.c +++ b/net/socket.c @@ -791,9 +791,9 @@ static ssize_t sock_sendpage(struct file *file, struct page *page, sock = file->private_data; - flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; - if (more) - flags |= MSG_MORE; + flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; + /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ + flags |= more; return kernel_sendpage(sock, page, offset, size, flags); } -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/