On Wed, 2018-02-07 at 11:05 -0500, Tomasz Janowski wrote: > Package: src:linux > Version: 4.14.13-1~bpo9+1 > Severity: normal > Tags: upstream > > Dear Maintainer, > > > The problems seems to appear with some newer smartphones, in my case I > test Samsung Galaxy S8. 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 phone LTE and phone wireless network. > > Now, the problem is that download speeds are terrible, arounf 64 KB/s > while uploads are fast, the order of 15 MB/s. These speeds do not depend > on the provider, as the results are similar when I tether wi-fi. The USB > Ethernet interface on Linux host reports a lot of receive errors: > > enp0s20u9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 192.168.42.166 netmask 255.255.255.0 broadcast 192.168.42.255 > inet6 fe80::890:3fff:fe0e:d2c6 prefixlen 64 scopeid 0x20<link> > ether 0a:90:3f:0e:d2:c6 txqueuelen 1000 (Ethernet) > RX packets 716 bytes 859199 (839.0 KiB) > RX errors 459 dropped 0 overruns 0 frame 459 > TX packets 731 bytes 86682 (84.6 KiB) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
So these are all frame errors. There is a log message that would give
more information about them, but it's disabled by default. You can
enable it by running:
echo 'format "bad rndis message" +p' >
/sys/kernel/debug/dynamic_debug/control
[...]
> I tried the newest kernel from kernel.org git repositories, but the
> problem is still there. Should I contact upstream directly?
[...]
Yes, please mail linux-...@vger.kernel.org and net...@vger.kernel.org.
You should include a sample of the "bad rndis message" log messages
that should appear after running the above command. Please also cc
this bug address.
Ben.
--
Ben Hutchings
Reality is just a crutch for people who can't handle science fiction.
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