netdev - USB rndis_host - slow download transfers, RX errors

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Date:   Thu, 8 Feb 2018 14:16:08 +0000
From:   "Tomasz Janowski, Ph.D." <tomasz.janowski@...e.edu>
To:     USB list <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "889831@...s.debian.org" <889831@...s.debian.org>
Subject: USB rndis_host - slow download transfers, RX errors

Dear USB developers,

Based on my google research, the problem I experience seems to happen
with some newer smartphones. My test case is Samsung Galaxy S8 (SM-950U1). I am
trying to use USB tethering and everything seems to work as expected (modules
are loaded, Ethernet devices are up and running, dhcp works fine). I can connect to
the external world using both LTE or wireless network on the phone.

Now, the problem is that the download speeds are terrible, around 64 KB/s,
while uploads are fast, the order of 15 MB/s. These speeds do not depend
on the wireless service provider: the results are similar when I tether wi-fi.
The USB Ethernet interface on the Linux host reports a lot of receive errors (attached:
device_state.txt), while kernel reports bad rndis messages (attached: kernel.log.txt).

Windows 10 works great with the same hardware (same PC and same phone), with
uploads and downloads in the order of 150 Mbit/s, which is probably as fast as my
wireless network can do. But some people reported issues with older Windows drivers too.
Is possible that some newer version of RNDIS protocol is around and Linux hasn't updated
its RNDIS module yet?

Best,
Tomasz

View attachment "kernel.log.txt" of type "text/plain" (10336 bytes)

View attachment "device_state.txt" of type "text/plain" (879 bytes)