我很困惑地看到netcat和iperf结果之间的巨大差异。我有10G链接连接我的服务器和客户端。我的iperf大约是10Gb/s,但netcat只有大约280 MB/s。可能是什么错误?
对于Iperf
服务器
iperf -s
客户端
iperf -c 172.79.56.27 -i1 -t 10
结果:
Client connecting to 172.79.56.27, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 172.79.56.28 port 46058 connected with 172.79.56.27 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 1.07 GBytes 9.23 Gbits/sec
[ 3] 1.0- 2.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 2.0- 3.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 3.0- 4.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 4.0- 5.0 sec 1.09 GBytes 9.36 Gbits/sec
[ 3] 5.0- 6.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 6.0- 7.0 sec 1.09 GBytes 9.36 Gbits/sec
[ 3] 7.0- 8.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 8.0- 9.0 sec 1.09 GBytes 9.36 Gbits/sec
[ 3] 9.0-10.0 sec 1.09 GBytes 9.35 Gbits/sec
[ 3] 0.0-10.0 sec 10.9 GBytes 9.34 Gbits/sec
对于netcat,
服务器
nc -v -v -l -n 2222 >/dev/null
客户端
time dd if=/dev/zero | nc -v -v -n 172.79.56.27 2222
Connection to 172.79.56.27 2222 port [tcp/*] succeeded!
^C6454690+0 records in
6454690+0 records out
3304801280 bytes (3.3 GB) copied, 11.4463 s, 289 MB/s
real 0m11.449s
user 0m6.868s
sys 0m15.372s
Mr user1352179,
再次运行netcat测试,并在另一个窗口中观看htop。我打赌你会看到这里的瓶颈是dd读取/dev/zero的单个线程。请尝试再次与dd|netcat的"n"个实例并行运行测试,其中"n"=系统中的内核数。然后将所有并行运行的总带宽相加,以查看实际结果。(确保你在不同的端口上传输,让你的接收端运行多个线程,并在多个端口上侦听)。