This is my first time setting up a Raspberry Pi4 (8GB). Before, I have used a RPi 3B for some other things. From what i have read is, that IO performance should be a lot better on the RPi4, as with the RPi3B. But i get the same speeds as before. I have setup the following:

  • Installed Raspbian Lite (64bit)
  • enabled SFTP/SSH
  • Setup a user for SFTP only access, with home on a connected USB HDD
  • the USB HDD is connected to one of the USB3 ports
  • This is the same setup on the RPi3B

When I now try to start to copy a 2GB file from my Laptop via LAN, i get in both cases a max of 11.6 or 11,5MB/s. But according to articles like this (https://www.jeffgeerling.com/blog/2021/raspberry-pi-25-gbps-16-tb-omv-nas-setup-and-performance), it should be much faster. Is there some secret, or whats the problem?

BTW: The Laptop runs on Manjaro Linux, where i start the transfer, there is no Windows available.

  • sudo_su@feddit.deOP
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    1 year ago

    The speed looks fine for me on the Laptop itself:

    /dev/sda:
     Timing cached reads:   28080 MB in  1.98 seconds = 14161.28 MB/sec
     Timing buffered disk reads: 448 MB in  3.02 seconds = 148.55 MB/sec
    
     /dev/sda:
     Timing O_DIRECT cached reads:   604 MB in  2.00 seconds = 301.42 MB/sec
     Timing O_DIRECT disk reads: 454 MB in  3.02 seconds = 150.36 MB/sec
    

    On the Pi itself i get:

    /dev/sda:
     Timing cached reads:   1974 MB in  2.00 seconds = 988.54 MB/sec
     Timing buffered disk reads: 196 MB in  3.02 seconds =  64.91 MB/sec
    
    /dev/sda:
     Timing O_DIRECT cached reads:   122 MB in  2.01 seconds =  60.64 MB/sec
     Timing O_DIRECT disk reads: 194 MB in  3.03 seconds =  64.03 MB/sec
    

    This also much above the speed, i got, when i transfer files via SFTP/SCP.

    I have tested also iperf and got: 0.0000-10.2100 sec 113 MBytes 93.1 Mbits/sec

    It seems like this is really somewhere limiting to 100MBit.

    • sudo_su@feddit.deOP
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      1 year ago

      It seems the limiting factor is the switch or cable. If i connect the Rpi to the router directly, i get: 0.0000-10.1222 sec 281 MBytes 233 Mbits/sec

      • sudo_su@feddit.deOP
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        1 year ago

        Its the cable. After changing the cable between the Switch and the Router, i got iperf test up to: 0.0000-10.0416 sec 1.09 GBytes 932 Mbits/sec.

        We had some workmen in the house a few weeks ago. Apparently, they damaged the cable. The test cable was unfortunately too short for permanent use, but it was enough for testing. I now get an upload of 65MB/sec on an average. This is about the same as the limit I had already determined through hdparm on the RPi4. I don’t know, why hdparm is faster directly on the laptop, maybe the USB Controller is not the best on the RPi4. But anything is better than 11MB/sec.

        The situation is different when the laptop is only connected to the network via WiFi. Here I get a maximum of 28MB/sec. I have not yet found a solution how this could be faster.