OpenBSC June 2017

openbsc@lists.osmocom.org

23 participants
42 discussions

21 Jun '17

Hi. I've problem figuring out how to use osmo-ci in jenkins: the build steps for osmo-bts-gerrit and osmo-pcu-gerrit look pretty-much the same but osmo-pcu fails with: osmo-layer1-headers.sh: command not found while osmo-bts (which uses other scripts from osmo-ci) works fine. Any ideas where this difference might come from? -- Max Suraev <msuraev(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte

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how to use the CTRL interface to set TRAPs.
by emily mcmilin 20 Jun '17

20 Jun '17

Hi all, I have some uncertainty about how to use the CTRL interface to set TRAPs. In the OsmoBSC user manual (for example), the example provided doesn't specify an option to set for the 'var' I might be particularly interested in monitoring: `$ ./bsc_control.py -d localhost -m` Is this the default to monitor all? Can I go about narrowing this? Also, I don't feel like I quite understand the TRAP portion of "Table 2: Variables available over control interface" in the OsmoBSC user manual: For example, the 'name' column seems to generally indicate the 'var' that one would pass in a GET/SET command, so I'm assuming the 'name' associated with the TRAP-enabled rows has the same significance. But these 'names' have no real meaning to me in terms of my experience with VTY, for example 'notification'. I have tried to look toward the osmo-nitb unit tests for inspiration, as there is fantastic coverage for GET/SET, out haven't seen similar for TRAP. Can someone please point me in the right direction? Thanks, Emily

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jenkins: Osmocom_Sanitizer build fails
by Neels Hofmeyr 19 Jun '17

19 Jun '17

Today I noticed that the Osmocom_Sanitizer build has been broken for a long time, failing at libosmocore/src/viterbi_sse.c. But that seems like the fault of the way the Osmocom_Sanitizer builds: When I build libosmocore with --enable-sanitize, everything works out. When I instead build with `make CFLAGS+="..."', some CFLAGS are dropped and the build fails. The working commandline is: ./configure --enable-sanitize make V=1 [...] gcc -DHAVE_CONFIG_H -I. -I.. -I../include -I../include -fsanitize=address -fsanitize=undefined -Wall -g -O2 -fsanitize=address -fsanitize=undefined -msse3 -msse4.1 -MT viterbi_sse.lo -MD -MP -MF .deps/viterbi_sse.Tpo -c viterbi_sse.c -fPIC -DPIC -o .libs/viterbi_sse.o The failing one is: ./configure make CFLAGS+="-fsanitize=address -fsanitize=undefined" V=1 [...] gcc -DHAVE_CONFIG_H -I. -I.. -I../include -I../include -fsanitize=address -fsanitize=undefined -Wall -fsanitize=address -fsanitize=undefined -MT viterbi_sse.lo -MD -MP -MF .deps/viterbi_sse.Tpo -c viterbi_sse.c -fPIC -DPIC -o .libs/viterbi_sse.o i.e. in the failing build, these cmdline args are missing: -O2 -g -msse3 -msse4.1 So it seems that the CFLAGS+="stuff" is not working as intended. The alternative is to build with the ./configure --enable-sanitize, which I added at some point. But not all libs have this switch, AFAIR. I have added the --enable-sanitize configure option to libosmocore, and asked others to follow up in other repositories in the same fashion. I think this hasn't worked out everywhere yet. Does it make sense to refresh the sanitize build effort?: switch the Osmocom_Sanitizer build to using this configure flag and add it where it is missing. But I guess we should instead add the sanitize switch to each individual build script for the various *osmo* build jobs and switch off the Osmocom_Sanitizer build instead. I repeat myself, but adding --enable-sanitize is not a lot of effort. See http://git.osmocom.org/libosmocore/commit/?id=a23817622b28cb1969a73ffd36da5… I created https://osmocom.org/issues/2330 ~N

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core/conv: further Viterbi decoder optimizations
by Vadim Yanitskiy 18 Jun '17

18 Jun '17

Dear all, I would like to know your opinions about some optimizations of Viterbi decoder, which were already discussed previously. First of all, I would like to share some benchmarking results. I used the test cases ("osmo-conv-test"), written by Tom Tsou, to ensure that SIMD optimization is integrated correctly. And, shortly speaking, the results are almost equal. Older version of decoder is a little bit faster, but I think it's because one is being compiled with "-march=native". Returning back to the subject, as we allocate and free some memory on every osmo_conv_decode_acc() call, what may happen very frequently and tear down performance on some hardware, there was the following suggestions: 1) Use static memory allocation where it's possible. 2) Use talloc for dynamic allocation. 3) Internal caching: Fri May 9 18:23:03 UTC 2014, Tom Tsou wrote: > Internal caching was in the original implementation, but > stripped from the submitted version mainly for simplicity > and avoiding the need for global variables, though we seem > to be having that discussion anyway ;-) The trellis values > can be cached based on pointer or hashed code. That works well > until threading is involved and cache access needs to be locked. > Those are features I need, but can probably be ignored in this > case. > > Again, I think the API should be kept intact. Internal caching, > can be a topic for later discussion. So, I am open for your ideas, opinions and remarks. With best regards, Vadim Yanitskiy.

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aoip branch in openbsc.git
by Neels Hofmeyr 18 Jun '17

18 Jun '17

Hi Philipp, I have rebased the 'aoip' branch onto openbsc master. A test by the osmo-gsm-tester of this state was successful. Pending is to also verify voice and all of 3G still works there (will then update vlr_2G and vlr_3G branches). Some commits have been amended to, a) adjust libsmpp changes to use vlr_subscr, b) fix the msc_vlr unit tests after your rename of a_tx() and a_page() (don't really know why I didn't hit that earlier). c) add one comment So beware, if you rebase your most recent patches onto the 'aoip' branch, git may want to apply a few patches again because they slightly differ, even though their commit logs are identical. You need to sanity-check with 'rebase -i'. ~N

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osmo-bts-trx: "No clock from osmo-trx"
by Neels Hofmeyr 16 Jun '17

16 Jun '17

Hi Tom and others, in our testing setup, we have sporadic failures (~2 out of 10 times) with: DOML <0001> bts.c:208 Shutting down BTS 0, Reason No clock from osmo-trx What would be possible reasons for this failure, and how can we go about fixing it? Some more logging around it: 20170614032014399 DRSL <0000> rsl.c:2333 (bts=0,trx=0,ts=0,ss=2) Fwd RLL msg EST_IND from LAPDm to A-bis 20170614032018533 DL1C <0006> scheduler_trx.c:1451 PC clock skew: elapsed uS 4136730 20170614032018533 DOML <0001> bts.c:208 Shutting down BTS 0, Reason No clock from osmo-trx 20170614032018533 DL1C <0006> scheduler.c:240 Exit scheduler for trx=0 20170614032018533 DL1C <0006> scheduler.c:216 Init scheduler for trx=0 20170614032018533 DOML <0001> oml.c:280 OC=RADIO-CARRIER INST=(00,00,ff) AVAIL STATE OK -> Off line [...] Shutdown timer expired (We're using an external 10MHz OCXO timing source) It appears there's four seconds of nothing from osmo-trx? Most curious is that the next run will be completely fine, until some time later we get this same failure. We wait until osmo-trx logs -- Transceiver active with 1 channel(s) and then we "immediately" or up to a second later launch osmo-bts-trx. Would it help to give it more grace time?? Thanks! ~N

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Re: osmo-bts-trx: "No clock from osmo-trx"
by Vadim Yanitskiy 15 Jun '17

15 Jun '17

Neels, > What would be possible reasons for this failure, > and how can we go about fixing it? As I know, this happens when scheduler detects, that system time is changed. For example, it might be caused by NTP time correction. - Do you have NTP enabled? - Have you specified process realtime priority? With best regards, Vadim Yanitskiy.

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osmo-gsm-tester - voice call
by Sudhanthiradasan R 14 Jun '17

14 Jun '17

Hi, Is it possible to perform end-to-end testing like voice calls, sms etc with current osmo-gsm-tester version. I do not see any suites for voice call testing in the suites directory. Thanks Sudhanthiradasan R ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ----------------------------------------------------------------------------------------------------------------------------------------------------

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Re: New Defects reported by Coverity Scan for Osmocom
by Neels Hofmeyr 12 Jun '17

12 Jun '17

Max, you fixed the coverity issue in https://gerrit.osmocom.org/2885, but a few lines above that, there is another +1 that seems one +1 too many: if (m_id_len > MAX_BTS_FEATURES/8 + 1) { LOGP(DNM, LOGL_NOTICE, "BTS%u Get Attributes Response: feature vector is truncated to %u bytes\n", bts->nr, MAX_BTS_FEATURES/8); m_id_len = MAX_BTS_FEATURES/8; } I can't claim I understand why this size check is necessary on top of the other one, but certainly "> MAX_BTS_FEATURES/8 + 1" doesn't match setting "m_id_len = MAX_BTS_FEATURES/8". ~N

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Voice audio testing in osmo-gsm-tester
by Harald Welte 12 Jun '17

12 Jun '17

Dear all, osmo-gsm-tester is currently capable of setting up an entire network with one or more BTSs, Modems, NITB, etc. and test signaling + SMS. Voice testing has always been on the wishlist, but further down on the TODO list. One issue here is that a) many modems don't do voice at all (data-only modems for laptops) b) some modems expose voice only as analog audio (difficult to interface, would require custom hardware next to the modem, e.g. using USB soundcard, calibrate the levels, ...) c) some modems expose the voice as PCM bus. Similarly, would require some external codec chip and/or USB soundcard or the like, plus a custom circuit d) some modems expose voice as "GSM codec frames over UART" or other highty proprietary formats e) some modems expose voice as USB audio device. Most convenient, but only found in some Qualcomm LE based devices such as Sierra Wireless or Quectel. Over the weekend I was thinking of yet another method to make this much simpler: Every phone is supposed to include a voice loop-back mode. In this mode, the phone siply loops back all voice frames received in the downlink and sends them back in the uplink. This functionality is mandatory by the spec, and used to test the receiver performance of the phone during development, manufacturing and service. IT is specified in 3GPP TS 44.014 (http://www.etsi.org/deliver/etsi_ts/144000_144099/144014/14.00.00_60/ts_144…) which used to be GSM TS 04.04 (http://www.etsi.org/deliver/etsi_ts/101200_101299/101293/08.06.00_60/ts_101…) before. The idea is that one puts a special "Test SIM" (as specified in TS 51.010-1 Annex 4, where EF.AD first byte == 0x80 is the criteria in this context) into the phone, and then sends some specific commands on Layer3 to activate the loop. So if we can activate that loop-back functionality from the Osmocom stack, we could test if we get back the same voice data that we send in downlink (minus some occasional bit error, but those should be super low given we're operating omso-gsm-tester over coaxial cabling between MS and BTS). Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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OpenBSC June 2017