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I've set up an Raspberry pi in a network with Gigabit NICs. On an SSD I have set up an shared SMB directory. The SSD itself writes with more than 400 Mbyte/s. Due to an encryption this drops to 160-200 Mbytes/s. Still, when I do an upload, it maxes out at 30 Mbyte/s. I would expect 100-110 Mbyte/s in this particular network setting. What can I do to increase performance?

EDIT: I checked which speed I get via a wired connection to the network switch. Here I receive 65 Mbyte/s in reading and 50 Mbyte/s in writing. Is this bottleneck caused by the CPU of the rasberry? As mentioned earlier: The SSD as well as the network should support full Gbit speed... What is your bandwhich?

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I have an RPi4 NAS with two HDDs myself and get gigabit speeds. But of course only when the HDDs are connected to the USB 3.0 ports. USB 2 is about 30MB/s. So you probably have the hard drives on the USB 2 ports.

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  • No of course not. As I wrote, I get up to 200 Mbytes write speed with dd if I write direct to the partition of the drive. It is only with smb, the bandwhich drops. CPU is also not maxed out.
    – northcom
    Jan 13, 2022 at 7:10
  • Sorry, I thought the speeds were from another PC. Maybe this link will help you. superuser.com/questions/713248/….
    – JJandke
    Jan 13, 2022 at 7:41
  • OK, I tested the network and with iperf I get about 960 Mbit over the network swith. Therefore the ethernet is not thr problem here. I am wondering: What speed do you get out of the box with smb and the raspberry pi4? My version is the 8 GB.
    – northcom
    Jan 16, 2022 at 22:24
  • Sorry for the late response! Depending on the type of file I'm copying, I can get up to 120 MB/s (960 Mbit/s) with, for exaple, large video- or .iso-files. On the other hand, if I copy a folder with many small text files (e.g. code, etc.), the speed drops down to a few MB/s, because the creation of new documents takes time. So it is "faster" to copy one big file instead of many small ones.
    – JJandke
    Jan 17, 2022 at 20:10

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