[Freeswitch-users] Timing issues in AWS?

[Michael Picher]

Hi guys,

Trying to get to the bottom of some conference bridge issues I'm having
with running the system in AWS.

We're hearing a bunch of snap-crackle-pops in conference bridges and when I
tcpdum on the server itself I see them in the RTP and see RTP timestamp
problems.

I've run the following:


timer_test
freeswitch at 127.0.0.1@internal> timer_test 120 10

Avg: 120.004ms Total Time: 1200.315ms

2011-11-16 10:25:56.121131 [CONSOLE] mod_commands.c:461 Timer Test:
samplecount after init: 1
freeswitch at 127.0.0.1@internal> 2011-11-16 10:25:56.219163 [CONSOLE]
mod_commands.c:466 Timer Test: samplecount after first step: 2
2011-11-16 10:25:56.339195 [CONSOLE] mod_commands.c:475 Timer Test: 1 sleep
120 120006
2011-11-16 10:25:56.459259 [CONSOLE] mod_commands.c:475 Timer Test: 2 sleep
120 120040
2011-11-16 10:25:56.579259 [CONSOLE] mod_commands.c:475 Timer Test: 3 sleep
120 119976
2011-11-16 10:25:56.699291 [CONSOLE] mod_commands.c:475 Timer Test: 4 sleep
120 120007
2011-11-16 10:25:56.819318 [CONSOLE] mod_commands.c:475 Timer Test: 5 sleep
120 120001
2011-11-16 10:25:56.939375 [CONSOLE] mod_commands.c:475 Timer Test: 6 sleep
120 120031
2011-11-16 10:25:57.059397 [CONSOLE] mod_commands.c:475 Timer Test: 7 sleep
120 119996
2011-11-16 10:25:57.179422 [CONSOLE] mod_commands.c:475 Timer Test: 8 sleep
120 119994
2011-11-16 10:25:57.299461 [CONSOLE] mod_commands.c:475 Timer Test: 9 sleep
120 120005
2011-11-16 10:25:57.419478 [CONSOLE] mod_commands.c:475 Timer Test: 10
sleep 120 119991

test_time
freeswitch at 127.0.0.1@internal> time_test 600 10

test 1 sleep 600 1592
test 2 sleep 600 986
test 3 sleep 600 1018
test 4 sleep 600 980
test 5 sleep 600 1005
test 6 sleep 600 1000
test 7 sleep 600 972
test 8 sleep 600 990
test 9 sleep 600 1006
test 10 sleep 600 994
avg 1054

For kernel:
[root at openuc bin]# uname -r

2.6.21.7-2.fc8xen

CONFIG_HZ:
[root at openuc bin]# grep CONFIG_HZ /boot/config-*

/boot/config-2.6.16.33-xenU-x86_64:CONFIG_HZ_100=y
/boot/config-2.6.16.33-xenU-x86_64:# CONFIG_HZ_250 is not set
/boot/config-2.6.16.33-xenU-x86_64:# CONFIG_HZ_1000 is not set
/boot/config-2.6.16.33-xenU-x86_64:CONFIG_HZ=100
/boot/config-2.6.18-164.15.1.el5.centos.plus:# CONFIG_HZ_100 is not set
/boot/config-2.6.18-164.15.1.el5.centos.plus:# CONFIG_HZ_250 is not set
/boot/config-2.6.18-164.15.1.el5.centos.plus:CONFIG_HZ_1000=y
/boot/config-2.6.18-164.15.1.el5.centos.plus:CONFIG_HZ=1000
/boot/config-2.6.21-2952.fc8xen:# CONFIG_HZ_100 is not set
/boot/config-2.6.21-2952.fc8xen:# CONFIG_HZ_250 is not set
/boot/config-2.6.21-2952.fc8xen:# CONFIG_HZ_300 is not set
/boot/config-2.6.21-2952.fc8xen:CONFIG_HZ_1000=y
/boot/config-2.6.21-2952.fc8xen:CONFIG_HZ=1000

are the xenU kernel settings screwing me here?

Thanks,
  Mike


-- 
There are 10 kinds of people in this world, those who understand binary and
those who don't.

mpicher at gmail.com
blog: http://www.sipxecs.info
call: sip:mpicher at sipxecs.info
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