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使用 ftpes SOC 到 PC 的传输速度很慢

tag-icon • tag-icon performance ftp gigabit-ethernet
使用 ftpes SOC 到 PC 的传输速度很慢

问题：

我在千兆网络上将文件从连接到 SOC 的外部机箱传输到 PC 的 SSD 时，速度只有约 30MB/s。我本以为传输速度会更快。我使用的是 FTPES，也尝试过 SCP，两者的速度上限都在 30MB/s 左右

背景：

我有一台 SOC（Odroid XU4），配有千兆以太网网卡和 USB 3.0 集线器。它连接到千兆以太网管理交换机（Cisco sg200-08），后者连接到千兆以太网路由器（Netgear R8000），我的电脑连接到该路由器（也配有千兆网卡）。

设备：

SOC: Odroid XU4
External Disks: 4TB 5400 RPM
Switch: Cisco sg200-08
Router: Netgear R8000
Computer: Custom build with gigabit ethernet

图表：

SOC -> Gigabit Switch -> Gigabit Router -> Gigabit NIC pc

现在我测试了从 SOC 到磁盘的读取速度：

kevin@ftpbox:~$ sudo hdparm -Tt /dev/sda
/dev/sda:
 Timing cached reads:   2008 MB in  2.00 seconds = 1005.91 MB/sec
 Timing buffered disk reads: 364 MB in  3.00 seconds = 121.21 MB/sec
kevin@ftpbox:~$ sudo hdparm -Tt /dev/sdb'
> ^C
kevin@ftpbox:~$ sudo hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   2004 MB in  2.00 seconds = 1003.25 MB/sec
 Timing buffered disk reads: 394 MB in  3.01 seconds = 130.74 MB/sec
kevin@ftpbox:~$ sudo hdparm -Tt /dev/sdc

/dev/sdc:
 Timing cached reads:   2008 MB in  2.00 seconds = 1005.80 MB/sec
 Timing buffered disk reads: 394 MB in  3.01 seconds = 130.83 MB/sec
kevin@ftpbox:~$ sudo hdparm -Tt /dev/sdd

/dev/sdd:
 Timing cached reads:   1982 MB in  2.00 seconds = 992.31 MB/sec
 Timing buffered disk reads: 394 MB in  3.01 seconds = 130.83 MB/sec

我也尝试过从两台不同的机器上执行 iperf，我的电脑运行 Windows，我的路由器运行 dd-wrt ​​到我的 SOC

PC 至 SOC：

kevin@ftpbox:~$ iperf -c 192.168.1.2 -p 5201
------------------------------------------------------------
Client connecting to 192.168.1.2, TCP port 5201
TCP window size: 20.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.22 port 47193 connected with 192.168.1.2 port 5201
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  0.00 (null)s  2350133821636822 Bytes/sec
kevin@ftpbox:~$ iperf -c 192.168.1.2 -p 5201
------------------------------------------------------------
Client connecting to 192.168.1.2, TCP port 5201
TCP window size: 20.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.22 port 47194 connected with 192.168.1.2 port 5201
^C[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 2.1 sec  0.00 (null)s  2354598378962423 Bytes/sec
kevin@ftpbox:~$ iperf -s
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.1.22 port 5001 connected with 192.168.1.2 port 63008
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-20.2 sec  14.0 Bytes  5.55 bits/sec

我从路由器获得的结果与 SOC 类似

路由器到 SOC：

kevin@ftpbox:~$ iperf -c 192.168.1.1 -p 5201
------------------------------------------------------------
Client connecting to 192.168.1.1, TCP port 5201
TCP window size: 20.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.22 port 58115 connected with 192.168.1.1 port 5201
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  0.00 (null)s  2350254378773930 Bytes/sec
kevin@ftpbox:~$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.1.22 port 5001 connected with 192.168.1.1 port 55060
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-64.8 sec  14.0 Bytes  1.73 bits/sec

以下是 ifconfig 对适配器的说明：

kevin@ftpbox:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1e:06:31:a6:81  
          inet addr:192.168.1.22  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:6ff:fe31:a681/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5592 errors:0 dropped:4 overruns:0 frame:0
          TX packets:3022 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:855874 (855.8 KB)  TX bytes:433684 (433.6 KB)

这是我的 SOC 适配器功能：

kevin@ftpbox:~$ ethtool eth0
Settings for eth0:
        Supported ports: [ MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                             100baseT/Half 100baseT/Full 
                                             1000baseT/Full 
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00007fff (32767)
                               drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
        Link detected: yes

速度这么低是怎么回事？我应该检查什么？有什么想法吗？

答案1

答案如下：

我应该提到我正在使用采用 tls 的 vsftpd。我启用了 cipher=HIGH 标志。这导致 SOC 上的 CPU 崩溃。我在 vsftpd 上禁用了 ssl，但速度达到 70MB/s

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