Troubleshooting • Re: RPi 4 NVME over Network transfer speed issue

Interesting. Your disk is significantly slower than mine (Kingston A400 on a Startech USB3 adapter), but not sufficiently slower to be your root cause.

You said that you're copying TO the NVME drive, but the hdparm test only tests read performance, which is typically faster, sometimes significantly, than write performance.

What do you get when, on the Pi4 you do:

Code:

rm -f foo.datdd if=/dev/zero of=foo.dat bs=16M count=128 oflag=nocache

I'm seeing a solid 110MB-115MB/sec writing to the local SSD:

Code:

rm -f foo.dat ; dd if=/dev/zero of=foo.dat bs=16M count=128 oflag=nocache128+0 records in128+0 records out2147483648 bytes (2.1 GB, 2.0 GiB) copied, 18.8175 s, 114 MB/s

Not totally scientific, just trying to rule out possible suspects.

dd if=/dev/zero of=foo.dat bs=16M count=128 oflag=nocache128+0 records in128+0 records out2147483648 bytes (2.1 GB, 2.0 GiB) copied, 53.9675 s, 39.8 MB/s

Statistics: Posted by mrlmh — Thu Mar 07, 2024 12:36 am