Delayed ACK 和 nagle算法
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Nagle算法作用为延迟发送,其意为,不足MSS的数据直到收到确认再发送
Nagle’s Algorithm:(RFC 896)
if there is new data to send if the window size >= MSS and available data is >= MSS send complete MSS segment now else if there is unconfirmed data still in the pipe enqueue data in the buffer until an acknowledge is received else send data immediately end if end if end if
延迟确认为减少通道中包的数目,如果应答方有数据传输,或有两个ACK需要发送,则发送数据包,否则等待,直到timer超时
Delayed ACK: (RFC1122)
while(timer<ack_delayed_timer) { if(there_is_a_segment_from_source()) segment_received++; if(segment_received==1 && is_possible_piggy_back()) { piggy_back(sequence_number_of_the_last_segment+1); # ACK within the data segment_received=0; timer=0; break; } # if 2 consecutive segments are received, we send a pure ACK if(segment_received==2) { send_pure_ack(sequence_number_of_the_last_segment+1); segment_received=0; timer=0; break; } }
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