[Freeswitch-users] minimum UDP packet size

Madovsky infos at madovsky.org
Tue Feb 1 18:27:17 MSK 2011

No my question is minimum udp.
usually the max udp packet is around 65000kB,
David was talking about MTU which is different (Max Transmit Unit
which is usually 1500 over the net, but ins some internal network (as my cluster)
I use jumbo frames (9000) with 1GB network cards.
by default linux kernel UDP min packet is set to 4096.
I made some tests, from 1024 to 65000 and the server behavior looks like more
cool when packet is big, but I'm almost sure that it creates also more latency in case
of audio data. I'm finally happy to use exactly the same rate as MTU, performance
seems to be better in multitask.
  ----- Original Message ----- 
  From: Erik Dekkers 
  To: 'FreeSWITCH Users Help' 
  Sent: Tuesday, February 01, 2011 4:28 AM
  Subject: Re: [Freeswitch-users] minimum UDP packet size

  You probably mean a MAXimum size. If you set a minimum size it would always fragment.

  As far as I know it itsn't possible to set a maximum size of a UDP packet. If the UDP packets are getting too large you really should trim down SIP headers / Remove codecs from the SDP.


  There are some articles on the internet concerning MTU and SIP.




  Van: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] Namens Madovsky
  Verzonden: maandag 31 januari 2011 18:29
  Aan: freeswitch-users at lists.freeswitch.org
  Onderwerp: [Freeswitch-users] minimum UDP packet size


  is it useful to set minimum UDP  pakcet to the

  MTU rate like 1500 and avoid any fragmentation ?




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