[Openais] Flow control / cpgbench

Fabien Thomas fabien.thomas at netasq.com
Fri Aug 22 01:03:58 PDT 2008


I'm testing the latest trunk under Darwin and i've some strange  
benchmark stop with flow control messages:

$./cpgbench
54115 messages received     1 bytes per write  10.004 Seconds runtime   
5409.525 TP/s   0.005 MB/s.
21050 messages received  1001 bytes per write  10.000 Seconds runtime   
2105.062 TP/s   2.107 MB/s.
22864 messages received  2001 bytes per write  10.000 Seconds runtime   
2286.301 TP/s   4.575 MB/s.
42131 messages received  3001 bytes per write  10.000 Seconds runtime   
4213.216 TP/s  12.644 MB/s.
55599 messages received  4001 bytes per write  10.000 Seconds runtime   
5560.081 TP/s  22.246 MB/s.
51113 messages received  5001 bytes per write  10.000 Seconds runtime   
5111.492 TP/s  25.563 MB/s.
10245 messages received  6001 bytes per write  10.000 Seconds runtime   
1024.538 TP/s   6.148 MB/s.
     0 messages received  7001 bytes per write  10.000 Seconds  
runtime     0.000 TP/s   0.000 MB/s.

At the time the message rate go down on the corosync log:

Aug 22  9:59:57.590518 [IPC  ] Enabling flow control [401/800] - [0].
Aug 22  9:59:57.753496 [IPC  ] Disabling flow control [403/800] - [0].

to my understanding flow control will slow down when overflowed but  
restart the flow when ready to process more data?

Fabien
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