fisherman:~# cat /proc/sys/net/ipv4/tcp_low_latency
0
在看TCP的Fast Path的过程中，看到了这个设置，找一个linuxinsight的解释。
If set, the TCP stack makes decisions that prefer lower latency as
opposed to higher throughput. By default, this option is not set
meaning that higher throughput is preferred. An example of an
application where this default should be changed would be a Beowulf
compute cluster.
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