nagle

Does setting TCP_NODELAY affect the behaviour of both ends of the socket?

由 南楼画角 提交于 2020-01-22 19:33:17
问题 I've always assumed that Nagle's algorithm affected the socket in both directions, and that setting TCP_NODELAY somehow informed the remote end also to switch off Nagle. Is that right, or does setting TCP_NODELAY only affect the behaviour of the end that calls it? 回答1: TCP_NODELAY affect sending TCP segments only on the host that sets this option on its socket. That is, the peer's sending algorithm is not affected. 来源： https://stackoverflow.com/questions/8226512/does-setting-tcp-nodelay

Is there an equivalent to TCP_CORK in Winsock?

由 早过忘川 提交于 2019-12-19 03:26:37
问题 In many UNIX TCP implementations, a socket option TCP_CORK is provided which allows the caller to bypass Nagle's algorithm and explicitly specify when to send a physical packet. Is there an equivalent feature in Windows (Winsock)? TCP_CORK (since Linux 2.2) If set, don't send out partial frames. All queued partial frames are sent when the option is cleared again. This is useful for prepending headers before calling sendfile(2), or for throughput optimization. As currently implemented, there

Disabling nagle in python: how to do it the right way?

由 怎甘沉沦 提交于 2019-12-12 09:59:16
问题 I need to disable nagle algorithm in python2.6. I found out that patching HTTPConnection in httplib.py that way def connect(self): """Connect to the host and port specified in __init__.""" self.sock = socket.create_connection((self.host,self.port), self.timeout) self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True) # added line does the trick. Obviously, I would like to avoid patching system lib if possible. So, the question is: what is right way to do such thing? (I'm pretty new

Can't turn TCP_NODELAY OFF

由 落爺英雄遲暮 提交于 2019-12-11 07:57:53
问题 I'm using Boost asio to send a TCP message. I set the NO_DELAY option because this is a 'real time' control system. I see the PSH flag set in the message using Wireshark. I am happy with the performance and it is working as expected. For interest, I decided to turn the NO_DELAY off and measure the performance difference. I swapped my existing code: m_tcpSocket.open(boost::asio::ip::tcp::v4()); boost::asio::ip::tcp::no_delay noDelayOption(true); m_tcpSocket.set_option(noDelayOption); // snip

What happened to the TCP Nagle flush?

由 一个人想着一个人 提交于 2019-12-10 13:48:27
问题 According to this Socket FAQ article, Nagle's algorithm is one of many algorithms that can cause a bunch of data to sit in the TCP buffer and not hit the wire. The delay from the Nagle algorithm can be up to 200ms. For some reason, Nagle's algorithm can be turned off completely , but not flushed just once. This is really puzzling to me. Why is there no way to say that "just this one time, don't wait for any more data. Just act as if Nagle's 200ms are up." Wouldn't that make perfect sense, and

重读TCP/IP(7)之TCP数据传输

由 Deadly 提交于 2019-12-07 14:28:47
TCP 数据传输 TCP 的数据传输分为两种，一种是交互式数据，一种是块数据，交互式数据如 Telnet ，一般都是小于 10 个字节的分组，而成块数据如 FTP 传输文件，基本都是大于 512 字节的报文，对于这两种数据， TCP 的处理机制是不一样的，算法也不相同，下面是一个 telnet 的抓包，由于此处讨论的主要是交互数据，而不是 telnet 协议，因此抓包主要集中在交互上 CentOS release 5.3 (Final) Kernel 2.6.18-128.el5 on an x86_64 login: qa Password: Last login: Fri May 13 15:35:27 from 10.103.51.142 [qa@hding ~]$ ls Desktop hello socat-1.7.3.0.tar.gz [qa@hding ~]$ #ls 1. IP 10.103.51.142.57545 > 10.8.116.6.telnet: P 73:74(1) ack 199 win 16375 C->S ‘l’ 2. IP 10.8.116.6.telnet > 10.103.51.142.57545: P 199:200(1) ack 74 win 46 S->C ‘l’ 3. IP 10.103.51.142.57545 > 10.8

Does setting TCP_NODELAY affect the behaviour of both ends of the socket?

由 牧云@^-^@ 提交于 2019-12-04 04:03:52
I've always assumed that Nagle's algorithm affected the socket in both directions, and that setting TCP_NODELAY somehow informed the remote end also to switch off Nagle. Is that right, or does setting TCP_NODELAY only affect the behaviour of the end that calls it? TCP_NODELAY affect sending TCP segments only on the host that sets this option on its socket. That is, the peer's sending algorithm is not affected. 来源： https://stackoverflow.com/questions/8226512/does-setting-tcp-nodelay-affect-the-behaviour-of-both-ends-of-the-socket

Is there an equivalent to TCP_CORK in Winsock?

由 岁酱吖の 提交于 2019-11-30 23:31:51
In many UNIX TCP implementations, a socket option TCP_CORK is provided which allows the caller to bypass Nagle's algorithm and explicitly specify when to send a physical packet. Is there an equivalent feature in Windows (Winsock)? TCP_CORK (since Linux 2.2) If set, don't send out partial frames. All queued partial frames are sent when the option is cleared again. This is useful for prepending headers before calling sendfile(2), or for throughput optimization. As currently implemented, there is a 200 millisecond ceiling on the time for which output is corked by TCP_CORK. If this ceiling is

Is there any significant difference between TCP_CORK and TCP_NODELAY in this use-case?

由 本小妞迷上赌 提交于 2019-11-29 01:00:37
问题 After writing an answer about TCP_NODELAY and TCP_CORK, I realized that my knowledge of TCP_CORK's finer points must be lacking, since it's not 100% clear to me why the Linux developers felt it necessary to introduce a new TCP_CORK flag, rather than just relying on the application to set or clear the existing TCP_NODELAY flag at the appropriate times. In particular, if I have a Linux application that wants to send() some small/non-contiguous fragments of data over a TCP stream without paying

How would one disable Nagle's algorithm in Linux? [closed]

由 走远了吗. 提交于 2019-11-27 08:44:11
Is there a way to do it through the command line? man tcp tells me that I need to set tcp_nodelay=1, but I am unable to create the tcp_nodelay file under /proc/sys/net/ipv4. Please let me know if there's any way of disabling Nagle in Linux. This flag ( TCP_NODELAY ) is an option that can be enabled on a per-socket basis and is applied when you create a TCP socket. This is done for a purpose: Nagle's algorithm is generally useful and helps handle network congestion. I doubt you want to disable it system-wide since your system will probably suffer from this deactivation. To disable it for a
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