AR300M 2.261 - slow scp / rsync

nopro404 · 2017-09-13T01:36:57.000Z

I’m having some issues with SCP. I am copying a file from a remote host on the internet to a local USB drive plugged into the AR300M.

I seem to recall getting over 700KBps with SCP before. Something has happened, and I’m not sure what.

Without VPN enabled I get the following speeds (same source host and destination USB)

curl I get 1750KBps

scp I get 160KBps

With VPN enabled I get:

curl 480 KBps

scp 160KBps

The CPU is not pegged. load average is around 0.5 even with VPN enabled, so it is not CPU bound.

nopro404 · 2017-09-13T16:17:55.000Z

Okay I guess after a firmware reset I lost openssh-client . I reinstalled that and scp and rsync is back to 1.2MB/s without VPN and 500KB/s through VPN.

Didn’t realize how much faster openssh is over dropbear on these little routers!

alzhao · 2017-09-14T23:44:03.000Z

Seems the problem is not ssh, but when you write to USB storage when connected to WiFi. Reading should be fine.

nopro404 · 2017-09-15T08:06:48.000Z

Nope it was dropbear causing the bad performance. OpenSSH is much faster. As noted in first post reading over the network via curl (http) I was writing to the USB device at 1750KBps.

Using DD I tested write performance to the USB device to be 2.7MBps .