Change in osmo-bts[master]: osmo-bts-trx: Change default for clock_advance to 3

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fixeria gerrit-no-reply at lists.osmocom.org
Sun Apr 12 10:02:29 UTC 2020


fixeria has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/17766 )

Change subject: osmo-bts-trx: Change default for clock_advance to 3
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Patch Set 1:

I did a quick test, and it works for me: 0% packet loss, ping delay is around 500ms (compared to 800-1000). 

> I think there is a big potential for any such change to break existing setups that we are not familiar with (particularly slow CPU, or whatever).
> What we need to do is to create a situation where any underruns due to too low fn-advance are clearly identified and brought to the attention of the user in a way that he knows exactly what he needs to do.

I am absolutely agree with Harald. It would also be nice if osmo-bts-trx could somehow measure the delay and pick the right fn-advance value at run-time.

> As (I think) only osmo-trx currently knows about this, I would suggest to [...]

As far as I remember, osmo-trx even has a rate counter for such events (device:tx_underruns?).

> * introduce a wahy onw osmo-trx can report downlink underruns via TRXC

See https://osmocom.org/issues/4006#note-33.


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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I7da3d0948f38e12342fb714b29f8edc5e9d0933d
Gerrit-Change-Number: 17766
Gerrit-PatchSet: 1
Gerrit-Owner: daniel <dwillmann at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: daniel <dwillmann at sysmocom.de>
Gerrit-Reviewer: dexter <pmaier at sysmocom.de>
Gerrit-Reviewer: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-Comment-Date: Sun, 12 Apr 2020 10:02:29 +0000
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