¿Debo desactivar el algoritmo de Nagle?

Should I disable Nagle algorithm?

Nagle’s algorithm should be disabled by enabling TCP_NODELAY by the requester in this case. If the response data can be larger than a packet, the responder should also disable Nagle’s algorithm by enabling TCP_NODELAY so the requester can promptly receive the whole response.

Nagle’s algorithm is a means of improving the efficiency of TCP/IP networks by reducing the number of packets that need to be sent over the network. The RFC describes what he called the “small-packet problem”, where an application repeatedly emits data in small chunks, frequently only 1 byte in size.

Nagle’s algorithm suggests: Sender should send only the first byte on receiving one byte data from the application. Sender should buffer all the rest bytes until the outstanding byte gets acknowledged. In other words, sender should wait for 1 RTT(Round Trip Time).

The TCPNODELAY option specifies whether the server disables the delay of sending successive small packets on the network. You fully understand the effects of the TCP Nagle algorithm on network transmissions. Setting the option to NO enables the Nagle algorithm, which delays sending small successive packets.

Nagle’s algorithm, named after John Nagle, is way to improve TCP efficiency by reducing the # of packets sent over the network. The idea is that when an application repeatedly send small packets, for each packet, TCP still tacks on a 40 byte header, that’s a lot of potential overhead.

Naegele’s rule (Nagel’s rule) predicts an estimated due date based on the woman’s last menstrual period. This page only provides an estimate for the due date, and does not take into account small changes such as leap years. It also does not take into affect months with less than 31 days.

Neither changes it the TcpNoDelay setting, nor is it an “allowed” mod, but instead “use at your own risk”.

1. Right click the empty place, and choose New to create two DWORD Values.
2. Rename these values as ‘TcpAckFrequency’ (sending out packets immediately)
3. and ‘TCPNoDelay’ (Disabling Nagle-Algorithm)
4. Double click both the entries to Modify.
5. Put 1 as their Value data to activate them, and click OK to save your changes.

If data to be sent is less than MSS, it is buffered till the data to be sent is greater than or equal to MSS. Under the right conditions, the 1-3 points outlined under Delayed ACK and A-B points outlined in Nagle’s Algorithm will freeze the interaction between the sender and the receiver for the duration of timeout which is roughly 200ms.

It is very important to understand the interactions between Nagle’s algorithm and Delayed ACKs. The TCP_NODELAY socket option allows your network to bypass Nagle Delays by disabling Nagle’s algorithm, and sending the data as soon as it’s available. Enabling TCP_NODELAY forces a socket to send the data in its buffer, whatever the packet size.

For example: Delayed ACK tries to send more data per segment if it can. But part of Nagle’s algorithm depends on an ACK to send data. Nagle’s algorithm and Delayed ACKs together create a problem because Delayed ACKs are waiting around to send the ACK while Nagle’s is waiting around to receive the ACK!

TCP delayed acknowledgment or Delayed ACK is another technique used by some implementations of the TCP in an effort to improve network performance and reduce congestion. Delayed ACK was invented to reduce the number of ACKs required to acknowledge the segments and reduce the protocol overhead.