I have been trying to resolve this for a few days now, by USB attached SSD (EXT4) when accessed via samba share on windows PC only gets 5mb/s download or upload.
PI4 is connects on wifi 5G at 150mb-200mb. Internet speed test run from the pi in chromium shows 60mb/s. wifi shows a good connection at -50dBM.
Minidlna works really well with files accessed from the same SSD, fast scrubbing through video files.
On the pi local copy from USB to SD card of a 800mb file takes 1-3 seconds, local speeds of ssd seems to be about 300mb/s
I have added the "quirk" patch dmesg shows this has applied. I still cannot get anything above 5mb/s (800mb file). I have tried from windows and from chromebook and android same slow speed.
I can't find any other fixes to try can anyone advise any further debugging i can do please? I tried setting up VSFTP to test ftp but spent 4 hours failing to get a directory listing so gave up trying to compare FTP to samba.
Any advise really appreciated, any logs i can check etc.
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The FTP performance is very good, compared to Samba. But most servers are too complicated, incompatible and restrictive, even if you only want to use it on your local network.
I found that the SmbFTPD (which is used in Synology NAS and routers as well) is a very simple, compatible and the best choice in this case. And the rsync daemon.