[MERGED] osmo-bsc[master]: Change T3101 default from 10s to 3s.

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Harald Welte gerrit-no-reply at lists.osmocom.org
Tue Dec 12 17:59:46 UTC 2017


Harald Welte has submitted this change and it was merged.

Change subject: Change T3101 default from 10s to 3s.
......................................................................


Change T3101 default from 10s to 3s.

This timer is started when a channel is allocated with an IMMEDIATE
ASSIGNMENT message. It is stopped when the MS has correctly seized the
channel.  Ever since the early days of development we were using a very
long timeout to be on the safe side.  However, in production networks
this is a terrible waste of resources, as we will occupy 10s worth
of air-time on one of our channels for each RACH request we receive.

The only scenarios where you might need something absurdly high as 10s
would be if you have 8s of RTT between your BTS and the BSC.

See also https://osmocom.org/projects/osmobsc/wiki/Timers

Change-Id: If3c52a7cf0c06d074c44a2fc414679279189aab9
Closes: OS#2733
---
M include/osmocom/bsc/gsm_data.h
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  Pau Espin Pedrol: Looks good to me, but someone else must approve
  Max: Looks good to me, but someone else must approve
  Harald Welte: Looks good to me, approved
  Jenkins Builder: Verified



diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index a9512f5..a6c8198 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -262,7 +262,7 @@
 	GSM_AUTH_POLICY_REGEXP, /* accept IMSIs matching given regexp */
 };
 
-#define GSM_T3101_DEFAULT 10	/* s */
+#define GSM_T3101_DEFAULT 3	/* s */
 #define GSM_T3103_DEFAULT 5	/* s */
 #define GSM_T3105_DEFAULT 100	/* ms */
 #define GSM_T3107_DEFAULT 5	/* s */

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Gerrit-MessageType: merged
Gerrit-Change-Id: If3c52a7cf0c06d074c44a2fc414679279189aab9
Gerrit-PatchSet: 2
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Max <msuraev at sysmocom.de>
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>



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