21 Jul
2015
21 Jul
'15
7:25 p.m.
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "UNNAMED PROJECT".
The branch, jerlbeck/master has been updated
discards 6c359bf40f259d8ae844c63ef7122fc99962df6d (commit)
discards c8dc447bc2a617a63798c1f574aa93ffa327dd54 (commit)
discards 46109b5a9be73344fb91fb6b279e3767769a99c2 (commit)
discards 58eb783817e7b9a62aa165515737718eb5ac4bad (commit)
via 6eed1911fd619fb594a9d1a7fc734c1f62ff2f08 (commit)
via b31f5ef69963c4e8139515368a3bf867a5d76b00 (commit)
via d4ad731baecb1993481941b0cbb6b6d512708572 (commit)
via 4f666bc1136eb581d11dc47741928725c76b09c6 (commit)
This update added new revisions after undoing existing revisions. That is
to say, the old revision is not a strict subset of the new revision. This
situation occurs when you --force push a change and generate a repository
containing something like this:
* -- * -- B -- O -- O -- O (6c359bf40f259d8ae844c63ef7122fc99962df6d)
\
N -- N -- N (6eed1911fd619fb594a9d1a7fc734c1f62ff2f08)
When this happens we assume that you've already had alert emails for all
of the O revisions, and so we here report only the revisions in the N
branch from the common base, B.
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
http://cgit.osmocom.org/osmo-pcu/commit/?id=6eed1911fd619fb594a9d1a7fc734c1…
commit 6eed1911fd619fb594a9d1a7fc734c1f62ff2f08
Author: Jacob Erlbeck <jerlbeck(a)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
http://cgit.osmocom.org/osmo-pcu/commit/?id=b31f5ef69963c4e8139515368a3bf86…
commit b31f5ef69963c4e8139515368a3bf867a5d76b00
Author: Jacob Erlbeck <jerlbeck(a)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
http://cgit.osmocom.org/osmo-pcu/commit/?id=d4ad731baecb1993481941b0cbb6b6d…
commit d4ad731baecb1993481941b0cbb6b6d512708572
Author: Jacob Erlbeck <jerlbeck(a)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
used.
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
CoDel.
Also note that configuration changes are applied to new MS objects
only.
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.
Measurements:
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
parameters.
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
http://cgit.osmocom.org/osmo-pcu/commit/?id=4f666bc1136eb581d11dc4774192872…
commit 4f666bc1136eb581d11dc47741928725c76b09c6
Author: Jacob Erlbeck <jerlbeck(a)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
applied.
Sponsored-by: On-Waves ehf
-----------------------------------------------------------------------
Summary of changes:
tests/Makefile.am | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
hooks/post-receive
--
UNNAMED PROJECT