[asterisk-dev] [Code Review] Optimize chan_sip.c check_rtp_timeout() function

[Rob Gagnon]

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https://reviewboard.asterisk.org/r/1377/
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Review request for Asterisk Developers and Rob Gagnon.


Summary
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Copying from original post on Jira:

While reviewing how "rtptimeout" and "rtpholdtimeout" operate in code, I found that the check_rtp_timeout() function could be optimized a little to speed up asterisk performance.

Currently, three integers are fetched from the rtp instance multiple times apiece (causing of course, multiple stack operations)

In the worst-case scenario:
 - ast_rtp_instance_get_timeout() is called 4 times.
 - ast_rtp_instance_get_hold_timeout() is called 4 times.
 - ast_rtp_instance_get_keepalive() is called 3 times.
 
With this patch, each function will be called only once, thus removing up to 9 stack push/pops during runtime
Description posted on jira would be the same


This addresses bug ASTERISK-18319.
    https://issues.asterisk.org/jira/browse/ASTERISK-18319


Diffs
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  /trunk/channels/chan_sip.c 333000 

Diff: https://reviewboard.asterisk.org/r/1377/diff


Testing
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Compiled code with patch, ran on test system without any problems.  Turned logging way up, and verifiied that calls that were silent/disconnected by accident were still being hung-up on.


Thanks,

Rob

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