[asterisk-bugs] [DAHDI-linux 0013205]: [patch] bad master selection

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=13205 
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Reported By:                biohumanoid
Assigned To:                sruffell
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Project:                    DAHDI-linux
Issue ID:                   13205
Category:                   dahdi (the module)
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
JIRA:                        
Reviewboard Link:            
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Date Submitted:             2008-07-31 00:11 CDT
Last Modified:              2011-02-15 22:59 CST
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Summary:                    [patch] bad master selection
Description: 
Current dahdi master handling work in the following way:
The first SPAN become a master
If a new registered !!! SPAN is preferred , it is the new master
If a span is unregistered - the new master is the first available span
If master SPAN is in alarm state - the new master is the first non in
alarm state SPAN

So
1. dahdi-dummy once loaded will be the master forever.
2. even not-running SPAN can be a master
3. master implementation is ugly...
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Relationships       ID      Summary
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related to          0013206 [patch] ztdynamic double buffering on r...
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 (0132001) biohumanoid (reporter) - 2011-02-15 22:59
 https://issues.asterisk.org/view.php?id=13205#c132001 
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What is the best master for TDM systems ?
SPAN(analog/digital), DynamicSPAN(analog/digital), PC timer ?
It highly depends on customers configuration, but it should not be
hardcoded no way.
The best master is the expected master (by the custemer), because only
he/she know, what he/she want.

Samples:
2 DynamicSPAN devices. 1-st provide timing for DAHDI, DAHDI provide timing
for 2-nd device.
Device https://issues.asterisk.org/view.php?id=2 will tune it's oscillator for
the incoming ethernet packets.
That's the way my devices can work, XORCOM devices can work, someone else
can work.

1 SPAN device, 1 DynamicSPAN device.
SPAN device provide timing for DAHDI, DAHDI provide timing for Dynamic –
DynamicSPAN device.

dahdi_dummy, DynamicSPAN.
Dummy provide timing (hrtimer) for DAHDI, DAHDI provide timing for Dynamic
– DynamicSPAN device.

It's a samples from a real life, that's why I have to maintain my patched
release by release... 

Issue History 
Date Modified    Username       Field                    Change               
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2011-02-15 22:59 biohumanoid    Note Added: 0132001                          
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