Hi Denis,
What is the exact setup that you're using? Are you using GAtMux or the
kernel mux?
Actually the mux was the internal to oFono, Kernel MUX is planned for further
versions.
Can you check whether using synchronous writes to the TUN device fix your
problem? E.g. in new_bytes of gatrawip.c.
Changing priority from G_PRIORITY_NORMAL to G_PRIORITY_HIGH avoid the issue of
ring buffer overflow.
However the ring buffer usage is at 2/3. This mean that 2 packets of 1420 are
stored. A 3 one crash the system.
In Mobile data transfer, it is often the cases that latency of packets can be
much more greater that in wired network (RLC layer in Modem buffers incoming
packet to reassemble its and deliver packet in right order of reception). In
this case, several packet can be delivered by the Modem in burst. If another
packet are to closed, we get a new ring buffer overflow. This is why I believe
that this buffer need to be increase to avoid this situation.
Taking some logs (tcpdump, ofono and internal Modem logs) show that burst of
packets often occurs.
So to Fix this issue 2 actions is required:
- Set the G_PRIORITY_HIGH instead of NORMAL in g_io_add_watch_full
in g_io_set_write_handler function (avoid to change mechanism to synchronous
mode)
- Secure the ring buffer overflow increasing the size (for example to
7100: capacity to store 5 Packets of 1420 bytes seems enough).
For the dlc disconnection after a ring buffer overflow, I continue to suggest
to change the behavior. At the end user side, a shutdown of the Modem is not
the solution. There is not a Modem issue and all others functionalities of
the Modem not need to be deactivate (ongoing Call drop if ongoing, No
Emergency Call available during reinitialisation, etc ...)
Give me your feedback for the fix and tell me If you want me to submit a patch
with this proposition.
Regards
Carlos
-
Intel Corporation SAS (French simplified joint stock company)
Registered headquarters: Les Montalets- 2, rue de Paris,
92196 Meudon Cedex, France
Registration Number: 302 456 199 R.C.S. NANTERRE
Capital: 4,572,000 Euros
This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.
___
ofono mailing list
ofono@ofono.org
http://lists.ofono.org/listinfo/ofono
