[Freeswitch-users] Timing issues in AWS?

[Ken Rice]

Actually, consider this, you have 1 server running 10 different instances
for 10 different people and as AWS you have to try and be level handed about
how you hand out instances on a single node in your cloud cluster...

How do you make sure that instance 1 isnt hogging all the CPU time that
instances 9 ­ 10 need?

This is the nature of a timeshare system... This goes back to AS400s SYS
34¹s and 36¹s... Don¹t get me wrong I think AWS, and cloud computing in
general can be great for certain things (store and forward), but do you
really want to chance the interruptions in RealTime media streaming where
any delay in processing causes missed or dropped packets...


On 11/16/11 9:43 AM, "Michael Picher" <mpicher at gmail.com> wrote:

> 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
> 

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