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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
57 lines
2.3 KiB
Groff
57 lines
2.3 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_TCP_NODELAY 3 "30 Jun 2016" "libcurl 7.50.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_TCP_NODELAY \- set the TCP_NODELAY option
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay);
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.SH DESCRIPTION
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Pass a long specifying whether the TCP_NODELAY option is to be set or cleared
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(1 = set, 0 = clear). The option is set by default. This will have no effect
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after the connection has been established.
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Setting this option will disable TCP's Nagle algorithm. The purpose of this
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algorithm is to try to minimize the number of small packets on the network
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(where "small packets" means TCP segments less than the Maximum Segment Size
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(MSS) for the network).
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Maximizing the amount of data sent per TCP segment is good because it
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amortizes the overhead of the send. However, in some cases small segments may
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need to be sent without delay. This is less efficient than sending larger
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amounts of data at a time, and can contribute to congestion on the network if
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overdone.
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.SH DEFAULT
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1
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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TODO
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.SH AVAILABILITY
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Always. The default was changed to 1 from 0 in 7.50.2.
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH "SEE ALSO"
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.BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_TCP_KEEPALIVE "(3), "
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