osmo-pcu.git branch jerlbeck/master updated. 0.2-551-g6eed191

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commit 6eed1911fd619fb594a9d1a7fc734c1f62ff2f08
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Tue Jul 21 18:29:46 2015 +0200

    bssgp: Fix leak rate computation CS value
    Currently the initial_cs_dl value is used to compute the maximum leak
    rate. This can be too low if adaptive CS selection is used.
    This commit changes gprs_bssgp_tx_fc_bvc to derive the max CS level
    from the configuration.
    Sponsored-by: On-Waves ehf


commit b31f5ef69963c4e8139515368a3bf867a5d76b00
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Tue Jul 21 14:00:14 2015 +0200

    pcu: Enable LLC CoDel by default
    Currently CoDel is disabled by default.
    This commit enables CoDel on start up with the default interval time,
    equivalent to the 'queue codel' VTY command.
    To disable CoDel, use the 'no queue codel' command.
    Sponsored-by: On-Waves ehf


commit d4ad731baecb1993481941b0cbb6b6d512708572
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Fri Jul 17 16:39:09 2015 +0200

    llc: Use CoDel to drop packages from the LLC queue
    Currently packets are only dropped if they have reached their maximum
    life time. This leads to LLC queues being constantly filled under
    load, increasing the latency up to the maximum life time. This kind
    of bufferbloat hinders TCP's congestion avoidance algorithms. To keep
    the queues short, the CoDel active queue management algorithm can be
    This commit changes to llc_dequeue method to apply the CoDel
    algorithm to selectively drop LLC frames before they passed to the
    TBF layer to be encoded in BSNs. This feature is currently disabled
    by default.
    The CoDel state is managed per MS since the LLC queues are also kept
    in the MS objects.
    Note that there is still some buffering in the TBF objects, in the
    worst case (CS4) 3.5kByte + LLC-MTU octets are stored there. The
    resulting additional packet delay is not (yet) taken into account for
    Also note that configuration changes are applied to new MS objects
    The following VTY commands are added to the 'pcu' node:
    - queue codel           activates CoDel, the interval is selected by
                            the implementation
    - queue codel interval <1-1000>
                            activates CoDel with a fixed interval given
                            in centiseconds (10ms-10s)
    - no queue codel        deactivates CoDel
    Which interval value to use is still an open issue. For high speed
    links (e.g. Ethernet), CoDel suggests 100ms. For slower links, the
    expected RTT is recommended. The current implementation uses a
    default value of 2000ms.
    Note that the following measurements depend on several other factors,
    most notably the interaction with the SGSN's flow control. They are
    just examples to give an idea how CoDel might influence some
    The measurements have been done with a single E71, first with a
    running ping only (Idle), then with an additional TCP download
    of a 360k file (Busy). The CoDel interval was set to 1s.
    - Idle :
            ping ~400ms, avg queue delay 0ms, dropped 0
    - Busy, No CoDel:
            ping ~6s, avg queue delay 4-6s,
            dropped  0, scheduled  948, duration 54s
    - Busy, CoDel:
            ping 500-1500ms, avg queue delay ~600ms,
            dropped 77, scheduled 1040, duration 60s
    More measurements with two MS downloading in parallel (two
    independant measurements per case).
    - Busy, No CoDel:
            dropped  0, scheduled 1883, duration 121s
            dropped 19, scheduled 2003, duration 133s
    - Busy, CoDel:
            dropped 22, scheduled 1926, duration 116s
            dropped 22, scheduled 1955, duration 108s
    Sponsored-by: On-Waves ehf


commit 4f666bc1136eb581d11dc47741928725c76b09c6
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Mon Jul 20 12:40:42 2015 +0200

    llc: Add CoDel AQM implementation
    This commit adds an implementation of the CoDel algorithm based on
    the reference pseudocode presented in
    http://queue.acm.org/appendices/codel.html. Instead of abstracting
    the queue itself, the implementation provides a time stamp based
    automaton which is invoked after a package has been dequeued.
    Note that the modifications of the algorithm shown in
    https://tools.ietf.org/html/draft-ietf-aqm-codel-01 are not yet
    Sponsored-by: On-Waves ehf


Summary of changes:
 tests/Makefile.am | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


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