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Scaling	
  FreeSWITCH	
  Performance	
  
ClueCon,	
  August	
  2015	
  
Moisés	
  Silva	
  <moy@sangoma.com>	
  
Manager,	
  So?ware	
  Engineering	
  	
  
About	
  Sangoma	
  
•  Industry	
  pioneer	
  with	
  over	
  25	
  years	
  of	
  experience	
  in	
  
communicaHons	
  hardware	
  and	
  so?ware	
  
•  Publicly	
  traded	
  company	
  since	
  2000	
  
–  TSXV:	
  STC	
  
•  One	
  of	
  the	
  most	
  financially	
  healthy	
  companies	
  in	
  our	
  industry	
  
–  Growing,	
  Profitable,	
  Cash	
  on	
  the	
  Balance	
  Sheet,	
  No	
  Debt	
  
•  Mid-­‐market	
  sized	
  firm	
  with	
  just	
  under	
  100	
  staff	
  in	
  all	
  global	
  
territories	
  
–  Offices	
  in	
  Canada	
  (Toronto),	
  US	
  (CA,	
  NJ),	
  EU	
  (UK	
  &	
  Holland),	
  APAC	
  
(India),	
  CALA	
  (Miami)	
  
•  World	
  wide	
  customer	
  base	
  
–  Selling	
  direct	
  to	
  carriers	
  and	
  OEMs	
  
–  Selling	
  to	
  the	
  enterprise	
  through	
  a	
  network	
  of	
  distribuHon	
  partners	
  
2	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Broad	
  Line	
  of	
  Great	
  Products	
  
•  Voice	
  Telephony	
  Boards	
  
–  Analog/digital/hybrid,	
  WAN,	
  ADSL	
  
•  Session	
  border	
  controllers	
  
•  Microso?	
  Lync	
  
•  VoIP	
  Gateways	
  
–  NetBorder	
  SIP	
  to	
  TDM	
  
–  SS7	
  to	
  SIP	
  
•  So?ware	
  ApplicaHons	
  
–  NetBorder	
  Express,	
  Call	
  Progress	
  
Analyzer…	
  
•  Transcoding	
  (boards/appliances)	
  
•  Fiber	
  connecHvity	
  (STM1)	
  
•  Wireless	
  products	
  (GSM)	
  
3	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
We’re	
  Hiring	
  
•  Linux	
  developers	
  C/C++	
  or	
  Python	
  
•  Anywhere	
  in	
  the	
  world,	
  relocaHon	
  paid	
  or	
  full	
  
Hme	
  remote	
  opportuniHes	
  
•  Fun	
  and	
  relaxed	
  work	
  environment	
  
	
  
4	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Agenda	
  
•  Performance	
  Basics	
  
•  FreeSWITCH	
  Core	
  Basics	
  
•  Performance	
  Tweaks	
  
•  Feature	
  Performance	
  Cost	
  
	
  
•  Final	
  Thoughts	
  
5	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Performance	
  Basics	
  
•  Performance	
  tesHng	
  and	
  measurement	
  is	
  
hard	
  to	
  do	
  and	
  	
  very	
  prone	
  to	
  errors	
  
•  Performance	
  can	
  change	
  widely	
  from	
  
seemingly	
  minor	
  hardware/so?ware	
  changes	
  
•  This	
  presentaHon	
  focuses	
  on	
  Linux	
  	
  and	
  SIP	
  
call	
  bridging	
  performance	
  
6	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Performance	
  Basics	
  
•  CPU-­‐Bound	
  
•  I/O	
  Bound	
  
•  Threads,	
  Resource/Lock	
  ContenHon	
  
•  You	
  cannot	
  improve	
  what	
  you	
  don’t	
  measure	
  
7	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  FreeSWITCH	
  is	
  an	
  insanely	
  threaded	
  system	
  
(the	
  good	
  kind	
  of	
  insane)	
  
	
  
8	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  Most	
  threads	
  are	
  I/O	
  bound	
  
•  But	
  transcoding,	
  transraHng,	
  tone	
  generaHon	
  
introduce	
  CPU-­‐bound	
  elements	
  into	
  the	
  mix	
  
•  FreeSWITCH	
  core	
  I/O	
  model	
  is	
  blocking,	
  not	
  
async	
  
9	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  Every	
  call	
  leg	
  has	
  its	
  own	
  session	
  thread	
  walking	
  
through	
  a	
  state	
  machine,	
  roughly,	
  like	
  this:	
  
	
  
•  init	
  -­‐>	
  rouHng	
  -­‐>	
  execute	
  app	
  -­‐>	
  hangup	
  -­‐>	
  reporHng	
  -­‐
>	
  destroy	
  
10	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  Monitoring	
  threads	
  per	
  signaling	
  stack	
  (e.g	
  sofia,	
  
freetdm)	
  
•  These	
  threads	
  are	
  long-­‐lived	
  and	
  perform	
  very	
  
specific	
  tasks	
  (e.g	
  process	
  SIP	
  signaling	
  out	
  of	
  a	
  call	
  
context,	
  iniHal	
  invite	
  etc)	
  
•  Event	
  subsystem	
  launches	
  threads	
  for	
  event	
  
dispatch	
  
11	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  Conferences	
  duplicate	
  your	
  use	
  of	
  threads	
  per	
  
call	
  leg.	
  For	
  each	
  parHcipant	
  you	
  have	
  2	
  threads:	
  
	
  
•  Session	
  thread	
  (handles	
  call	
  state	
  and	
  media	
  output)	
  
•  Input	
  conference	
  thread	
  (launched	
  when	
  joining	
  the	
  
conference,	
  reads	
  media	
  from	
  the	
  session)	
  
	
  
	
  	
  
12	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
FreeSWITCH	
  Core	
  
•  Even	
  small	
  features	
  might	
  launch	
  threads	
  
•  e.g.	
  Semng	
  Hmer=so?	
  when	
  performing	
  a	
  playback()	
  
launches	
  an	
  extra	
  thread	
  to	
  consume	
  media	
  from	
  the	
  
session	
  
	
  	
  
13	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Performance	
  Tweaks	
  
•  Logging	
  adds	
  stress	
  to	
  the	
  event	
  subsystem	
  
•  Every	
  log	
  statement	
  is	
  queued	
  as	
  an	
  event	
  
•  Every	
  log	
  statement	
  is	
  delivered	
  to	
  logger	
  
modules	
  (syslog,	
  file,	
  console)	
  
•  Set	
  core	
  logging	
  level	
  to	
  warning	
  in	
  
switch.conf.xml	
  
14	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Performance	
  Tweaks	
  
•  Do	
  not	
  write	
  debug	
  logs	
  to	
  an	
  SSD	
  in	
  a	
  loaded	
  
system.	
  You’ll	
  kill	
  the	
  SSD	
  soon	
  J	
  
•  If	
  you	
  want	
  to	
  keep	
  debug	
  level,	
  you	
  can	
  put	
  
logs	
  into	
  tmpfs	
  and	
  rotate	
  o?en	
  
15	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Database	
  
•  The	
  naHve	
  sqlite	
  core	
  database	
  must	
  go	
  to	
  
tmpfs	
  to	
  avoid	
  I/O	
  boplenecks	
  
•  On	
  tmpfs	
  however	
  you	
  risk	
  losing	
  SIP	
  
registraHon	
  data	
  on	
  a	
  power	
  outage	
  or	
  any	
  
sudden	
  restart	
  (e.g	
  kernel	
  panic)	
  
•  Most	
  other	
  data	
  is	
  transient	
  (e.g	
  channels,	
  sip	
  
dialogs,	
  etc)	
  
16	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Database	
  
•  Eventually	
  you	
  might	
  need	
  to	
  migrate	
  to	
  pgsql,	
  
mysql	
  or	
  some	
  other	
  database	
  via	
  odbc	
  
•  Allows	
  you	
  to	
  move	
  db	
  workload	
  elsewhere	
  
•  Beper	
  performance	
  for	
  applicaHons	
  that	
  read	
  
the	
  core	
  info	
  (channels,	
  calls,	
  etc)	
  
17	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Database	
  
•  Tables	
  such	
  as	
  channels,	
  calls,	
  tasks,	
  sip_dialogs,	
  	
  
do	
  not	
  need	
  to	
  persist.	
  You	
  can	
  move	
  those	
  
tables	
  to	
  memory	
  (e.g	
  MEMORY	
  engine	
  on	
  
MySQL)	
  if	
  you	
  don’t	
  need	
  fault	
  tolerance	
  
•  Remember	
  to	
  set	
  auto-­‐create-­‐schemas=false	
  
and	
  auto-­‐clear-­‐sql=false	
  if	
  you	
  create	
  the	
  db	
  
schema	
  on	
  your	
  own	
  (see	
  switch.conf.xml)	
  
18	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Database	
  
•  If	
  using	
  MySQL:	
  
•  Use	
  the	
  InnoDB	
  engine	
  for	
  beper	
  concurrency	
  in	
  data	
  
that	
  requires	
  persistence	
  (e.g	
  SIP	
  registraHon)	
  
•  innodb_flush_log_at_trx_commit=0	
  
•  sync_binlog=0	
  
19	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
SIP	
  Stack	
  
•  Sofia	
  launches	
  the	
  following	
  threads	
  per	
  profile:	
  
•  Main	
  profile	
  thread	
  (runs	
  sofia	
  UA	
  stack	
  scheduling)	
  
•  Worker	
  thread	
  (checks	
  expired	
  registraHons)	
  
•  Stack	
  listener	
  thread	
  (accepHng	
  inbound	
  traffic)	
  
•  You	
  can	
  distribute	
  your	
  traffic	
  among	
  more	
  sofia	
  
profiles	
  for	
  improved	
  concurrency	
  
20	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Memory	
  AllocaNon	
  
•  FreeSWITCH	
  uses	
  memory	
  pools	
  
•  Using	
  modules	
  that	
  depend	
  on	
  libraries	
  or	
  
modules	
  not	
  using	
  pools	
  can	
  benefit	
  from	
  using	
  
an	
  alternaHve	
  memory	
  allocator	
  
21	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Memory	
  AllocaNon	
  
•  tcmalloc	
  and	
  jemalloc	
  are	
  good	
  alternaHves	
  
•  Reports	
  on	
  the	
  mailing	
  list	
  of	
  improvement	
  if	
  
using	
  mod_perl	
  
•  Sangoma	
  found	
  very	
  significant	
  improvement	
  on	
  
its	
  SBC	
  (based	
  on	
  FreeSWITCH)	
  
	
  
22	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Memory	
  AllocaNon	
  
•  Easy	
  to	
  try	
  on	
  your	
  own	
  workload:	
  
•  LD_PRELOAD=“libtcmalloc.so.x.x.x"	
  ./freeswitch	
  
•  Recommended	
  to	
  run	
  mysql	
  with	
  either	
  
tcmalloc	
  or	
  jemalloc	
  
23	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Dialplan	
  
•  Careful	
  planning	
  of	
  your	
  dialplan	
  goes	
  a	
  long	
  
way	
  
•  Do	
  not	
  enable	
  funcHonality	
  you	
  don’t	
  need,	
  
everything	
  has	
  a	
  cost	
  
•  Just	
  loading	
  a	
  module	
  might	
  be	
  consuming	
  
precious	
  cpu	
  cycles	
  
24	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Dialplan	
  
•  Common	
  performance	
  factors	
  to	
  consider	
  (mind	
  
the	
  performance	
  cost	
  of	
  those	
  features):	
  
•  Media	
  relay	
  
•  Tone	
  DetecHon	
  
•  Recording	
  
•  Transcoding	
  
25	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Measurement	
  Tools	
  
•  switchy:	
  A	
  distributed	
  load-­‐generator	
  
•  hpps://github.com/sangoma/switchy	
  
•  vmstat	
  ploper	
  
•  hpps://clusterbuffer.wordpress.com/2014/09/21/
vmstat_ploper/	
  
	
  
26	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Test	
  Server	
  
•  Linux	
  CentOS	
  6	
  (kernel	
  2.6.x)	
  
•  FreeSWITCH	
  v1.4	
  git	
  branch	
  
•  Intel	
  Xeon	
  64bit	
  processor	
  w/	
  8	
  cores	
  
•  Intel	
  SSD	
  
•  16GB	
  of	
  RAM	
  
	
  
27	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Test	
  Lab	
  
28	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Test	
  FreeSWITCH	
  Server	
  
Switchy	
  
Load	
  Generator	
  
(FreeSWITCH)	
  
Load	
  Generator	
  
(FreeSWITCH)	
  
ESL	
  ESL	
  
SIP	
  
SIP	
  
2k@50cps	
  simple	
  audio	
  bridge	
  
29	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
2k@50cps	
  tone	
  detecNon	
  
30	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
1k@50cps	
  simple	
  audio	
  bridge	
  
31	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
1k@50cps	
  session	
  recording	
  
32	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
1k@50cps	
  transcoding	
  PCMU/G722	
  
33	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
4k@80cps	
  bypass	
  media	
  
34	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Dialplan	
  
•  Use	
  bypass	
  media	
  selecHvely	
  whenever	
  you	
  can	
  
•  Avoid	
  transcoding,	
  use	
  late-­‐negoHaHon	
  and	
  
inherit_codec=true	
  
•  If	
  you	
  must	
  do	
  transcoding,	
  you	
  can	
  offload	
  to	
  a	
  
hardware	
  transcoder	
  
35	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
Final	
  Thoughts	
  
•  You	
  have	
  to	
  measure	
  your	
  own	
  work	
  load	
  
•  No	
  easy	
  answers	
  with	
  performance,	
  but	
  you	
  
have	
  the	
  tools	
  to	
  find	
  what	
  works	
  for	
  you	
  
36	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
QUESTIONS	
  
Contact	
  Us	
  
•  Sangoma	
  Technologies	
  
100	
  Renfrew	
  Drive,	
  Suite	
  100	
  
Markham,	
  Ontario	
  L3R	
  9R6	
  
Canada	
  
•  Website	
  
hpp://www.sangoma.com/	
  
•  Telephone	
  
+1	
  905	
  474	
  1990	
  x2	
  (for	
  Sales)	
  
•  Email	
  
sales@sangoma.com	
  
Sangoma	
  Technologies	
  -­‐	
  ©	
  2015	
  
38	
  
THANK	
  YOU	
  

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Scaling FreeSWITCH Performance

  • 1. Scaling  FreeSWITCH  Performance   ClueCon,  August  2015   Moisés  Silva  <moy@sangoma.com>   Manager,  So?ware  Engineering    
  • 2. About  Sangoma   •  Industry  pioneer  with  over  25  years  of  experience  in   communicaHons  hardware  and  so?ware   •  Publicly  traded  company  since  2000   –  TSXV:  STC   •  One  of  the  most  financially  healthy  companies  in  our  industry   –  Growing,  Profitable,  Cash  on  the  Balance  Sheet,  No  Debt   •  Mid-­‐market  sized  firm  with  just  under  100  staff  in  all  global   territories   –  Offices  in  Canada  (Toronto),  US  (CA,  NJ),  EU  (UK  &  Holland),  APAC   (India),  CALA  (Miami)   •  World  wide  customer  base   –  Selling  direct  to  carriers  and  OEMs   –  Selling  to  the  enterprise  through  a  network  of  distribuHon  partners   2   Sangoma  Technologies  -­‐  ©  2015  
  • 3. Broad  Line  of  Great  Products   •  Voice  Telephony  Boards   –  Analog/digital/hybrid,  WAN,  ADSL   •  Session  border  controllers   •  Microso?  Lync   •  VoIP  Gateways   –  NetBorder  SIP  to  TDM   –  SS7  to  SIP   •  So?ware  ApplicaHons   –  NetBorder  Express,  Call  Progress   Analyzer…   •  Transcoding  (boards/appliances)   •  Fiber  connecHvity  (STM1)   •  Wireless  products  (GSM)   3   Sangoma  Technologies  -­‐  ©  2015  
  • 4. We’re  Hiring   •  Linux  developers  C/C++  or  Python   •  Anywhere  in  the  world,  relocaHon  paid  or  full   Hme  remote  opportuniHes   •  Fun  and  relaxed  work  environment     4   Sangoma  Technologies  -­‐  ©  2015  
  • 5. Agenda   •  Performance  Basics   •  FreeSWITCH  Core  Basics   •  Performance  Tweaks   •  Feature  Performance  Cost     •  Final  Thoughts   5   Sangoma  Technologies  -­‐  ©  2015  
  • 6. Performance  Basics   •  Performance  tesHng  and  measurement  is   hard  to  do  and    very  prone  to  errors   •  Performance  can  change  widely  from   seemingly  minor  hardware/so?ware  changes   •  This  presentaHon  focuses  on  Linux    and  SIP   call  bridging  performance   6   Sangoma  Technologies  -­‐  ©  2015  
  • 7. Performance  Basics   •  CPU-­‐Bound   •  I/O  Bound   •  Threads,  Resource/Lock  ContenHon   •  You  cannot  improve  what  you  don’t  measure   7   Sangoma  Technologies  -­‐  ©  2015  
  • 8. FreeSWITCH  Core   •  FreeSWITCH  is  an  insanely  threaded  system   (the  good  kind  of  insane)     8   Sangoma  Technologies  -­‐  ©  2015  
  • 9. FreeSWITCH  Core   •  Most  threads  are  I/O  bound   •  But  transcoding,  transraHng,  tone  generaHon   introduce  CPU-­‐bound  elements  into  the  mix   •  FreeSWITCH  core  I/O  model  is  blocking,  not   async   9   Sangoma  Technologies  -­‐  ©  2015  
  • 10. FreeSWITCH  Core   •  Every  call  leg  has  its  own  session  thread  walking   through  a  state  machine,  roughly,  like  this:     •  init  -­‐>  rouHng  -­‐>  execute  app  -­‐>  hangup  -­‐>  reporHng  -­‐ >  destroy   10   Sangoma  Technologies  -­‐  ©  2015  
  • 11. FreeSWITCH  Core   •  Monitoring  threads  per  signaling  stack  (e.g  sofia,   freetdm)   •  These  threads  are  long-­‐lived  and  perform  very   specific  tasks  (e.g  process  SIP  signaling  out  of  a  call   context,  iniHal  invite  etc)   •  Event  subsystem  launches  threads  for  event   dispatch   11   Sangoma  Technologies  -­‐  ©  2015  
  • 12. FreeSWITCH  Core   •  Conferences  duplicate  your  use  of  threads  per   call  leg.  For  each  parHcipant  you  have  2  threads:     •  Session  thread  (handles  call  state  and  media  output)   •  Input  conference  thread  (launched  when  joining  the   conference,  reads  media  from  the  session)         12   Sangoma  Technologies  -­‐  ©  2015  
  • 13. FreeSWITCH  Core   •  Even  small  features  might  launch  threads   •  e.g.  Semng  Hmer=so?  when  performing  a  playback()   launches  an  extra  thread  to  consume  media  from  the   session       13   Sangoma  Technologies  -­‐  ©  2015  
  • 14. Performance  Tweaks   •  Logging  adds  stress  to  the  event  subsystem   •  Every  log  statement  is  queued  as  an  event   •  Every  log  statement  is  delivered  to  logger   modules  (syslog,  file,  console)   •  Set  core  logging  level  to  warning  in   switch.conf.xml   14   Sangoma  Technologies  -­‐  ©  2015  
  • 15. Performance  Tweaks   •  Do  not  write  debug  logs  to  an  SSD  in  a  loaded   system.  You’ll  kill  the  SSD  soon  J   •  If  you  want  to  keep  debug  level,  you  can  put   logs  into  tmpfs  and  rotate  o?en   15   Sangoma  Technologies  -­‐  ©  2015  
  • 16. Database   •  The  naHve  sqlite  core  database  must  go  to   tmpfs  to  avoid  I/O  boplenecks   •  On  tmpfs  however  you  risk  losing  SIP   registraHon  data  on  a  power  outage  or  any   sudden  restart  (e.g  kernel  panic)   •  Most  other  data  is  transient  (e.g  channels,  sip   dialogs,  etc)   16   Sangoma  Technologies  -­‐  ©  2015  
  • 17. Database   •  Eventually  you  might  need  to  migrate  to  pgsql,   mysql  or  some  other  database  via  odbc   •  Allows  you  to  move  db  workload  elsewhere   •  Beper  performance  for  applicaHons  that  read   the  core  info  (channels,  calls,  etc)   17   Sangoma  Technologies  -­‐  ©  2015  
  • 18. Database   •  Tables  such  as  channels,  calls,  tasks,  sip_dialogs,     do  not  need  to  persist.  You  can  move  those   tables  to  memory  (e.g  MEMORY  engine  on   MySQL)  if  you  don’t  need  fault  tolerance   •  Remember  to  set  auto-­‐create-­‐schemas=false   and  auto-­‐clear-­‐sql=false  if  you  create  the  db   schema  on  your  own  (see  switch.conf.xml)   18   Sangoma  Technologies  -­‐  ©  2015  
  • 19. Database   •  If  using  MySQL:   •  Use  the  InnoDB  engine  for  beper  concurrency  in  data   that  requires  persistence  (e.g  SIP  registraHon)   •  innodb_flush_log_at_trx_commit=0   •  sync_binlog=0   19   Sangoma  Technologies  -­‐  ©  2015  
  • 20. SIP  Stack   •  Sofia  launches  the  following  threads  per  profile:   •  Main  profile  thread  (runs  sofia  UA  stack  scheduling)   •  Worker  thread  (checks  expired  registraHons)   •  Stack  listener  thread  (accepHng  inbound  traffic)   •  You  can  distribute  your  traffic  among  more  sofia   profiles  for  improved  concurrency   20   Sangoma  Technologies  -­‐  ©  2015  
  • 21. Memory  AllocaNon   •  FreeSWITCH  uses  memory  pools   •  Using  modules  that  depend  on  libraries  or   modules  not  using  pools  can  benefit  from  using   an  alternaHve  memory  allocator   21   Sangoma  Technologies  -­‐  ©  2015  
  • 22. Memory  AllocaNon   •  tcmalloc  and  jemalloc  are  good  alternaHves   •  Reports  on  the  mailing  list  of  improvement  if   using  mod_perl   •  Sangoma  found  very  significant  improvement  on   its  SBC  (based  on  FreeSWITCH)     22   Sangoma  Technologies  -­‐  ©  2015  
  • 23. Memory  AllocaNon   •  Easy  to  try  on  your  own  workload:   •  LD_PRELOAD=“libtcmalloc.so.x.x.x"  ./freeswitch   •  Recommended  to  run  mysql  with  either   tcmalloc  or  jemalloc   23   Sangoma  Technologies  -­‐  ©  2015  
  • 24. Dialplan   •  Careful  planning  of  your  dialplan  goes  a  long   way   •  Do  not  enable  funcHonality  you  don’t  need,   everything  has  a  cost   •  Just  loading  a  module  might  be  consuming   precious  cpu  cycles   24   Sangoma  Technologies  -­‐  ©  2015  
  • 25. Dialplan   •  Common  performance  factors  to  consider  (mind   the  performance  cost  of  those  features):   •  Media  relay   •  Tone  DetecHon   •  Recording   •  Transcoding   25   Sangoma  Technologies  -­‐  ©  2015  
  • 26. Measurement  Tools   •  switchy:  A  distributed  load-­‐generator   •  hpps://github.com/sangoma/switchy   •  vmstat  ploper   •  hpps://clusterbuffer.wordpress.com/2014/09/21/ vmstat_ploper/     26   Sangoma  Technologies  -­‐  ©  2015  
  • 27. Test  Server   •  Linux  CentOS  6  (kernel  2.6.x)   •  FreeSWITCH  v1.4  git  branch   •  Intel  Xeon  64bit  processor  w/  8  cores   •  Intel  SSD   •  16GB  of  RAM     27   Sangoma  Technologies  -­‐  ©  2015  
  • 28. Test  Lab   28   Sangoma  Technologies  -­‐  ©  2015   Test  FreeSWITCH  Server   Switchy   Load  Generator   (FreeSWITCH)   Load  Generator   (FreeSWITCH)   ESL  ESL   SIP   SIP  
  • 29. 2k@50cps  simple  audio  bridge   29   Sangoma  Technologies  -­‐  ©  2015  
  • 30. 2k@50cps  tone  detecNon   30   Sangoma  Technologies  -­‐  ©  2015  
  • 31. 1k@50cps  simple  audio  bridge   31   Sangoma  Technologies  -­‐  ©  2015  
  • 32. 1k@50cps  session  recording   32   Sangoma  Technologies  -­‐  ©  2015  
  • 33. 1k@50cps  transcoding  PCMU/G722   33   Sangoma  Technologies  -­‐  ©  2015  
  • 34. 4k@80cps  bypass  media   34   Sangoma  Technologies  -­‐  ©  2015  
  • 35. Dialplan   •  Use  bypass  media  selecHvely  whenever  you  can   •  Avoid  transcoding,  use  late-­‐negoHaHon  and   inherit_codec=true   •  If  you  must  do  transcoding,  you  can  offload  to  a   hardware  transcoder   35   Sangoma  Technologies  -­‐  ©  2015  
  • 36. Final  Thoughts   •  You  have  to  measure  your  own  work  load   •  No  easy  answers  with  performance,  but  you   have  the  tools  to  find  what  works  for  you   36   Sangoma  Technologies  -­‐  ©  2015  
  • 38. Contact  Us   •  Sangoma  Technologies   100  Renfrew  Drive,  Suite  100   Markham,  Ontario  L3R  9R6   Canada   •  Website   hpp://www.sangoma.com/   •  Telephone   +1  905  474  1990  x2  (for  Sales)   •  Email   sales@sangoma.com   Sangoma  Technologies  -­‐  ©  2015   38