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MultiCast very slow

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  • P
    plegrand @Wayne Workman
    last edited by Feb 11, 2016, 3:16 PM

    Now, just to see if multicast is the issue, can you multicast to just two computers? Make a temp group, put two computers in it, and then use that group to multicast. Is there a speed difference?

    I’ll make the test

    Also - the switch is important when multicasting.

    It 's Alcatel switch OS6250 and OS6450 configured like that : http://plegrand1.free.fr/pasted_image001.png
    I’m not sure if the configuration is ok
    Thanks for your help

    1 Reply Last reply Reply Quote 0
    • P
      plegrand @Wayne Workman
      last edited by plegrand Feb 22, 2016, 9:25 AM Feb 22, 2016, 3:21 PM

      @Wayne-Workman Hello
      just for information :
      On my switch i configure (force) the igmp version to “3”, may be i should use the default version : “2” ?

      An other question : i thought that fog used “udpcast” for multicasting, is it true ?

      W 1 Reply Last reply Feb 22, 2016, 4:57 PM Reply Quote 0
      • W
        Wayne Workman @plegrand
        last edited by Feb 22, 2016, 4:57 PM

        @plegrand said:

        On my switch i configure (force) the igmp version to “3”, may be i should use the default version : “2” ?

        Try it and let us know. at this point, anything that causes a change is good.

        An other question : i thought that fog used “udpcast” for multicasting, is it true ?

        I think fog uses udpsender.

        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
        Daily Clean Installation Results:
        https://fogtesting.fogproject.us/
        FOG Reporting:
        https://fog-external-reporting-results.fogproject.us/

        1 Reply Last reply Reply Quote 0
        • J
          JJ Fullmer Testers
          last edited by Feb 22, 2016, 8:54 PM

          @plegrand A couple questions
          What are the specs (cpu(s) model and speed, Ram speed and size, virtual/physical) of your FOG server?
          What are the specs of the workstations (specifically the slowest one)?
          What is the compression rating on the image you’re pushing?

          Something to understand about multicast (and someone should correct me if I’m wrong) is that is does all the decompression on the server and then sends the packets out following multicast protocol. The idea of multicast is to do more on the server side and less on the client and get a constant speed. It also is meant to prevent using a file or part of a file that is in use to make a fail safe against corrupting files and such. The downside is that if you’re using an image with a compression level of 9 and your server isn’t all that powerful, multi-cast is going to slow down a lot compared to unicast where decompression is done on the client.

          My point is if your server has less power or less optimization for decompressing then your clients, multicast will just be slower. Considering your speed difference of multicast and unicast, my guess would be this is the case.

          Also, a side note in favor of just using unicast, I have used fog to deploy to a lab of 40 computers (10 at a time, which can be changed with the Max clients setting in the storage configuration, just fyi) with the same image on unicast and had no problems with corruption and the speed was glorious.

          Another limiting factor is client and server port speeds. If your server is on a 10/100Mb port, you should upgrade that because it will make your life painful. But if your server is on a Gigabit switch then 10 clients on 100Mb switches will all run at around 1.7 GB/min (estimated mathematically and based on experience) If everything is on gigabit switches/ports then you might see a decrease in client speed as you add more simultaneous clients , but will still be around 2 or 3 times faster for 10 clients. Just to give you a little reference off the top of my head.

          It would probably be a good idea to start recording average speeds for common configurations and post them in the forum somewhere so people have a reference of how fast to configuration ought to be performing.

          Have you tried the FogApi powershell module? It's pretty cool IMHO
          https://github.com/darksidemilk/FogApi
          https://fogapi.readthedocs.io/en/latest/
          https://www.powershellgallery.com/packages/FogApi
          https://forums.fogproject.org/topic/12026/powershell-api-module

          W P 2 Replies Last reply Feb 22, 2016, 10:41 PM Reply Quote 1
          • W
            Wayne Workman @JJ Fullmer
            last edited by Feb 22, 2016, 10:41 PM

            @Arrowhead-IT said:

            Something to understand about multicast (and someone should correct me if I’m wrong) is that is does all the decompression on the server and then sends the packets out following multicast protocol.

            That’s wrong, multicast sends the data compressed just like unicast deployments do. Decompression happens on the client side. And the idea of multicast is to broadcast throughout a broadcast domain, in order to send data only once instead of many times. There is a lot of overhead with multicast, but the more clients that are receiving the stream, the bigger the payoff.

            Don’t feel bad - I thought the same thing, but tom corrected me then as I am now for you. The post is somewhere on here - from maybe a year ago lol.

            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
            Daily Clean Installation Results:
            https://fogtesting.fogproject.us/
            FOG Reporting:
            https://fog-external-reporting-results.fogproject.us/

            J 1 Reply Last reply Feb 23, 2016, 9:00 PM Reply Quote 1
            • P
              plegrand @JJ Fullmer
              last edited by Feb 23, 2016, 8:36 AM

              @Arrowhead-IT
              lscpu
              Architecture : x86_64
              Mode(s) opératoire(s) des processeurs : 32-bit, 64-bit
              Boutisme : Little Endian
              Processeur(s) : 8
              Liste de processeur(s) en ligne : 0-7
              Thread(s) par cœur : 2
              Cœur(s) par socket : 4
              Socket(s) : 1
              Nœud(s) NUMA : 1
              Identifiant constructeur : GenuineIntel
              Famille de processeur : 6
              Modèle : 30
              Nom de modèle : Intel® Xeon® CPU X3480 @ 3.07GHz
              Révision : 5
              Vitesse du processeur en MHz : 3059.238
              BogoMIPS : 6118.47
              Virtualisation : VT-x
              Cache L1d : 32K
              Cache L1i : 32K
              Cache L2 : 256K
              Cache L3 : 8192K
              Nœud NUMA 0 de processeur(s) : 0-7

              free -m
              total used free shared buffers cached
              Mem: 32233 1192 31040 23 196 624
              -/+ buffers/cache: 372 31860
              Swap: 65514 0 65514

              df -h
              Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
              /dev/sda1 8,2G 1,2G 6,6G 15% /
              udev 10M 0 10M 0% /dev
              tmpfs 6,3G 8,6M 6,3G 1% /run
              tmpfs 16G 0 16G 0% /dev/shm
              tmpfs 5,0M 0 5,0M 0% /run/lock
              tmpfs 16G 0 16G 0% /sys/fs/cgroup
              /dev/sda5 2,7G 445M 2,1G 18% /var
              /dev/sda7 360M 3,8M 334M 2% /tmp
              /dev/sda8 842G 25G 774G 4% /home

              eth0: NIC Copper Link is Up, 1000 Mbps full duplex
              eth1: NIC Copper Link is Up, 1000 Mbps full duplex

              I made a test : Multicast and unicast 12 stations

              **Multicast **=> 04h 40min
              **Unicast ** => 28min

              1 Reply Last reply Reply Quote 0
              • J
                JJ Fullmer Testers @Wayne Workman
                last edited by Feb 23, 2016, 9:00 PM

                @Wayne-Workman I wonder if I got compression part from that post a year ago. Some of that is what I remember from my college Networking class.

                @plegrand Looks like the problem shouldn’t be the server power, and I was wrong about that part anyway.
                Considering the speed difference you already are seeing, why not just use unicast? I’m just curious if there’s a specific requirement for multicast?

                Have you tried the FogApi powershell module? It's pretty cool IMHO
                https://github.com/darksidemilk/FogApi
                https://fogapi.readthedocs.io/en/latest/
                https://www.powershellgallery.com/packages/FogApi
                https://forums.fogproject.org/topic/12026/powershell-api-module

                1 Reply Last reply Reply Quote 0
                • S
                  Sebastian Roth Moderator
                  last edited by Mar 5, 2016, 11:36 AM

                  @plegrand Any news on this? Do you still see slow speeds when using multicast?

                  Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                  Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                  P 1 Reply Last reply Mar 5, 2016, 11:43 AM Reply Quote 0
                  • P
                    plegrand @Sebastian Roth
                    last edited by Mar 5, 2016, 11:43 AM

                    @Sebastian-Roth Hello
                    for the moment i didnt make any test about multicast.
                    But it’s planed
                    I will tell you
                    I have to look on switch configuration

                    1 Reply Last reply Reply Quote 0
                    • C
                      czajne
                      last edited by Sep 30, 2016, 10:46 AM

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