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Code Issues Releases Wiki Activity

CURLOPT_TCP_NODELAY: now enabled by default

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After a few wasted hours hunting down the reason for slowness during a
TLS handshake that turned out to be because of TCP_NODELAY not being
set, I think we have enough motivation to toggle the default for this
option. We now enable TCP_NODELAY by default and allow applications to
switch it off.

This also makes --tcp-nodelay unnecessary, but --no-tcp-nodelay can be
used to disable it.

Thanks-to: Tim Rühsen
Bug: https://curl.haxx.se/mail/lib-2016-06/0143.html
This commit is contained in:
Daniel Stenberg 2016-06-30 14:56:02 +02:00
parent edeabf741f
commit 4732ca5724
6 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
docs/libcurl/opts/CURLOPT_TCP_NODELAY.3
View File

@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
@ -20,7 +20,7 @@
.\" *
.\" **************************************************************************
.\"
.TH CURLOPT_TCP_NODELAY 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.TH CURLOPT_TCP_NODELAY 3 "30 Jun 2016" "libcurl 7.50.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_TCP_NODELAY \- set the TCP_NODELAY option
.SH SYNOPSIS
@ -29,8 +29,8 @@ CURLOPT_TCP_NODELAY \- set the TCP_NODELAY option
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay);
.SH DESCRIPTION
Pass a long specifying whether the TCP_NODELAY option is to be set or cleared
(1 = set, 0 = clear). The option is cleared by default. This will have no
effect after the connection has been established.
(1 = set, 0 = clear). The option is set by default. This will have no effect
after the connection has been established.
Setting this option will disable TCP's Nagle algorithm. The purpose of this
algorithm is to try to minimize the number of small packets on the network
@ -43,13 +43,13 @@ need to be sent without delay. This is less efficient than sending larger
amounts of data at a time, and can contribute to congestion on the network if
overdone.
.SH DEFAULT
0
1
.SH PROTOCOLS
All
.SH EXAMPLE
TODO
.SH AVAILABILITY
Always
Always. The default was changed to 1 from 0 in 7.50.2.
.SH RETURN VALUE
Returns CURLE_OK
.SH "SEE ALSO"

4
lib/http2.c
View File

@ -1849,10 +1849,6 @@ CURLcode Curl_http2_setup(struct connectdata *conn)
infof(conn->data, "Connection state changed (HTTP/2 confirmed)\n");
Curl_multi_connchanged(conn->data->multi);
/* switch on TCP_NODELAY as we need to send off packets without delay for
maximum throughput */
Curl_tcpnodelay(conn, conn->sock[FIRSTSOCKET]);
return CURLE_OK;
}

1
lib/url.c
View File

@ -602,6 +602,7 @@ CURLcode Curl_init_userdefined(struct UserDefined *set)
set->tcp_keepintvl = 60;
set->tcp_keepidle = 60;
set->tcp_fastopen = FALSE;
set->tcp_nodelay = TRUE;
set->ssl_enable_npn = TRUE;
set->ssl_enable_alpn = TRUE;

3
src/tool_cfgable.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -41,6 +41,7 @@ void config_init(struct OperationConfig* config)
CURLPROTO_SMBS);
config->proto_redir_present = FALSE;
config->proto_default = NULL;
config->tcp_nodelay = TRUE; /* enabled by default */
}
static void free_config_fields(struct OperationConfig *config)

4
src/tool_operate.c
View File

@ -792,8 +792,8 @@ static CURLcode operate_do(struct GlobalConfig *global,
set_binmode(stdout);
}
if(config->tcp_nodelay)
my_setopt(curl, CURLOPT_TCP_NODELAY, 1L);
if(!config->tcp_nodelay)
my_setopt(curl, CURLOPT_TCP_NODELAY, 0L);
if(config->tcp_fastopen)
my_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);

3
src/tool_setopt.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -157,6 +157,7 @@ static const NameValue setopt_nv_CURLNONZERODEFAULTS[] = {
NV1(CURLOPT_SSL_VERIFYHOST, 1),
NV1(CURLOPT_SSL_ENABLE_NPN, 1),
NV1(CURLOPT_SSL_ENABLE_ALPN, 1),
NV1(CURLOPT_TCP_NODELAY, 1),
NVEND
};