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Multicast very slow

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  • S
    Sebastian Roth Moderator
    last edited by Apr 11, 2019, 7:10 AM

    @plegrand Hey, welcome back to the forums! Reading your post I just remembered that we have been discussing this in the past already: https://forums.fogproject.org/topic/6655/multicast-very-slow

    the flow is very fast at the beginning then goes down to be very slow

    To me this sounds as if some of the clients are the bottleneck here. Maybe I am wrong but I think it’d be worth a try. Arrange your clients into smaller sub-groups of 3 machines in each group. Do multicast tests on each of those groups and see if the behaviour is exactly the same as before or if some sub-groups go faster than the others. Please note down the speeds and executing time of those multicast sessions and post results here.

    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 Apr 11, 2019, 8:19 AM Reply Quote 0
    • P
      plegrand @Sebastian Roth
      last edited by plegrand Apr 11, 2019, 2:26 AM Apr 11, 2019, 8:19 AM

      @Sebastian-Roth
      Hello Sebastian and thanks for your answer.
      I made these tests (sorry for the french words) :

      Troubleshoot MultiCast
      https://wiki.fogproject.org/wiki/index.php/Multicasting

      Afficher le mode debug sur les clients
      Menu Fog Configuration
      iPXE Menu Item Settings
      fog.debug
      L’option “Menu Show with” est par défaut sur “Debug Options”. La mettre sur “All hosts”

      Test avec 4 clients
      Sur le serveur, lancer la commande suivante :
      udp-sender --file /opt/fog/.fogsettings --log /opt/fog/log/multicast.log --ttl 32 --nopointopoint

      Sur les clients
      Booter en mode debug
      Commande : udp-receiver
      Sur le serveur, on doit voir les 4 clients connectés
      “Enter” pour lancer le transfert

      Sur le serveur
      “Enter” pour lancer le transfert

      Tests avec les postes:
      192.168.39.181
      192.168.39.145
      192.168.39.121
      192.168.39.189
      Multicast litening : 232.168.39.243

      Logs sur le serveur :

      New connection from 192.168.39.181  (#0) 00000009
      Ready. Press any key to start sending data.
      New connection from 192.168.39.145  (#1) 00000009
      Ready. Press any key to start sending data.
      New connection from 192.168.39.189  (#2) 00000009
      Ready. Press any key to start sending data.
      New connection from 192.168.39.121  (#3) 00000009
      Ready. Press any key to start sending data.
      
      094  re-xmits=0000002 (100.0%) slice=0112 -   0
      
      09:24:59.309910 Using mcast address 232.168.39.243
      09:24:59.309962 UDP sender for /opt/fog/.fogsettings at 192.168.39.243 on eth0 
      09:24:59.309973 Broadcasting control to 192.168.39.255
      09:25:03.709692 Using mcast address 232.168.39.243
      09:25:03.709744 UDP sender for /opt/fog/.fogsettings at 192.168.39.243 on eth0 
      09:25:03.709756 Broadcasting control to 192.168.39.255
      09:30:03.457992 Using mcast address 232.168.39.243
      09:30:03.458037 UDP sender for /opt/fog/.fogsettings at 192.168.39.243 on eth0 
      09:30:03.458047 Broadcasting control to 224.0.0.1
      10:13:28.830979 Starting transfer: 00000009
      10:13:28.842773 RETX         1    1
      10:13:28.843867 RETX         2    1
      10:13:28.844919 Transfer complete.
      10:13:28.845001 Disconnecting #0 (192.168.39.181)
      10:13:28.845050 Disconnecting #1 (192.168.39.145)
      10:13:28.845063 Disconnecting #2 (192.168.39.189)
      10:13:28.845075 Disconnecting #3 (192.168.39.121)
      10:13:28.845090
      

      For me it works fine. What do you think about that?

      1 Reply Last reply Reply Quote 0
      • P
        plegrand
        last edited by plegrand Apr 11, 2019, 2:48 AM Apr 11, 2019, 8:41 AM

        For information i’ve got these kinds of logs :
        http://plegrand1.free.fr/multicast.log.udpcast.6

        unicast works fine

        1 Reply Last reply Reply Quote 0
        • G
          george1421 Moderator
          last edited by Apr 11, 2019, 10:04 AM

          Well the first thing I see here is that your clients are on 100MB links. So that will limit your transfer rates to 12MB/s maximum (all traffic).

          Once the network settles down you are getting 25MB/s transfer rate is very good. Also the slowest computer in the multicast will be the maximum speed of your multicast.

          So I would ask you in your network design. What is the average unicast transfer rate when you image one computer (direct download not multicast)? Then send a multicast image to that same 1 computer. Is there a large difference?

          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!

          P 1 Reply Last reply Apr 11, 2019, 11:25 AM Reply Quote 0
          • P
            plegrand @george1421
            last edited by Apr 11, 2019, 11:25 AM

            @george1421
            unicast : 30minutes for 14 Computers
            multicast : 24hours for the same computers

            G 1 Reply Last reply Apr 11, 2019, 11:45 AM Reply Quote 0
            • G
              george1421 Moderator @plegrand
              last edited by Apr 11, 2019, 11:45 AM

              @plegrand said in Multicast very slow:

              @george1421
              unicast : 30minutes for 14 Computers
              multicast : 24hours for the same computers

              Sorry I was not clear in my request. I only want information on 1 computer (the same computer) One test via unicast and the second test via multicast. I want to compare the speeds between unicast and multicast on the same computer.

              To me you have too many variables in your environment. We need to understand the basics first.

              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!

              P 2 Replies Last reply Apr 11, 2019, 12:11 PM Reply Quote 0
              • P
                plegrand @george1421
                last edited by Apr 11, 2019, 12:11 PM

                @george1421 How can i make multicast on 1 computer? I can’t see this option

                G 1 Reply Last reply Apr 11, 2019, 12:14 PM Reply Quote 0
                • G
                  george1421 Moderator @plegrand
                  last edited by Apr 11, 2019, 12:14 PM

                  @plegrand

                  mcast_client_count.png

                  Then pxe boot the client and select the session name.

                  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!

                  P 2 Replies Last reply Apr 11, 2019, 12:16 PM Reply Quote 0
                  • P
                    plegrand @george1421
                    last edited by Apr 11, 2019, 12:16 PM

                    @george1421 Sorry but where is this “Start Multicast session” ?

                    1 Reply Last reply Reply Quote 0
                    • P
                      plegrand @george1421
                      last edited by Apr 11, 2019, 12:29 PM

                      @george1421
                      Image menu
                      Multicast Image
                      Start Multicast Session

                      1 Reply Last reply Reply Quote 0
                      • P
                        plegrand @george1421
                        last edited by Apr 11, 2019, 12:47 PM

                        @george1421

                        With only one computer it seams to works fine.

                        Unicast
                        c2b1320f-c025-478f-bcc5-d25eb8678311-image.png file:///home/pascal/Bureau/unicast.jpg

                        Multicast
                        b1e83cb1-140c-4d9e-b26a-9700b65acd8d-image.png file:///home/pascal/Bureau/multicast.jpg

                        G 1 Reply Last reply Apr 11, 2019, 12:59 PM Reply Quote 0
                        • G
                          george1421 Moderator @plegrand
                          last edited by Apr 11, 2019, 12:59 PM

                          @plegrand OK very good. This tells us that your network between the fog server and the target computer is good. You are getting ~28MB/s transfer rate. That’s a bit of a lie because your 100MB/s network can only transfer 12MB/s. The 20MB/s is the rate at which partclone can expand the image onto the disk of the target computer. But if you can’t feed partclone fast enough that rate will drop off quickly. If you are getting an expansion rate of the image faster than the network speeds your network rate is good.

                          Now can you make the same test with a computer located on the switch far away from the FOG server. In your drawing it would be the switch I want to test on the left of the drawing. This test will be the full network path between the fog server and the target PC.

                          One question I didn’t ask, how many target computers are in your multicast session?

                          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!

                          P 2 Replies Last reply Apr 11, 2019, 1:01 PM Reply Quote 0
                          • P
                            plegrand @george1421
                            last edited by plegrand Apr 11, 2019, 7:03 AM Apr 11, 2019, 1:01 PM

                            @george1421
                            To answer to your last question it was a session with 15 target computer and theses target computer was very near the fog server, on my drawing it’s the swith just below the fog server

                            G 2 Replies Last reply Apr 11, 2019, 1:15 PM Reply Quote 0
                            • G
                              george1421 Moderator @plegrand
                              last edited by Apr 11, 2019, 1:15 PM

                              @plegrand Well that makes me think a little differently if they are that near to your fog server.

                              Ok lets do a new test for multicast. Lets test 2 computers and then 3 computers. Now these computers must be the same model as the one done in your first test. We need to remove the variable of different models in this test.

                              What I expect to see for 2 computers is about the same speed as 1 computer in the multicast. For 3 computers slightly less than 2 computers. In my mind I question at what point do we go from an acceptable level of speed to bad.

                              I can tell you with unicasting on a pure 1GbE network you can fill up a 1GbE link with 3 simultaneous unicast deployments of FOG with modern target computers. That is a concern for the link to the fog server and switch to switch links mainly. Under a multicast you should get just slightly less than unicast speeds.

                              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!

                              P 3 Replies Last reply Apr 11, 2019, 1:33 PM Reply Quote 0
                              • G
                                george1421 Moderator @plegrand
                                last edited by Apr 11, 2019, 1:22 PM

                                @plegrand Also I just looked into these switching thinking they were old. They are not (at least performance wise) they are better capacity than Cisco small business switch SG300.

                                So I have to ask you why are you running 100MB/s to the desktops?

                                Do you have the capabilities to run a second network wire from the switch where the fog server is to the switch where the target computers are? (I’ll explain more if you can).

                                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!

                                P 2 Replies Last reply Apr 11, 2019, 1:32 PM Reply Quote 0
                                • P
                                  plegrand @george1421
                                  last edited by Apr 11, 2019, 1:22 PM

                                  @george1421
                                  With a target computer far from the fog server it seems to works also

                                  fddf7741-d626-4eb7-abe3-3625249a467c-image.png file:///home/pascal/Bureau/multicast-205.jpg

                                  1 Reply Last reply Reply Quote 0
                                  • P
                                    plegrand @george1421
                                    last edited by Apr 11, 2019, 1:32 PM

                                    @george1421
                                    I’m not sure to well understand
                                    Actually my diagram is not “really” true.
                                    The fog server is on a GB port
                                    All desktop clients are on 100 M ports
                                    I cant do anything else, no enough GB ports

                                    G 1 Reply Last reply Apr 11, 2019, 2:08 PM Reply Quote 0
                                    • P
                                      plegrand @george1421
                                      last edited by Apr 11, 2019, 1:33 PM

                                      @george1421 For these tests for the moment i’ve no time enough but i’ll do these tests in a near futur

                                      1 Reply Last reply Reply Quote 0
                                      • P
                                        plegrand @george1421
                                        last edited by plegrand Apr 11, 2019, 7:37 AM Apr 11, 2019, 1:36 PM

                                        @george1421 said in Multicast very slow:

                                        Do you have the capabilities to run a second network wire from the switch where the fog server is to the switch where the target computers are? (I’ll explain more if you can).

                                        It’s quiet already the case
                                        The switch (OS6250) where are connected all my target computers is just below the switch where the fog server is (OS6450).
                                        And directly connected by a 1GB link
                                        Then, only target computers are on a 100MB link

                                        1 Reply Last reply Reply Quote 0
                                        • G
                                          george1421 Moderator @plegrand
                                          last edited by Apr 11, 2019, 2:08 PM

                                          @plegrand said in Multicast very slow:

                                          I cant do anything else, no enough GB ports

                                          When I looked up the switch configuration it said that all ports are 10/100/1000 rated. Maybe I did not understand.

                                          The the OS6250 switch is only 100Mb/s then I understand why you have 100MB/s to the desktop.

                                          OK on delaying the test. There is a bottleneck someplace we just need to find it.

                                          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!

                                          P 1 Reply Last reply Apr 11, 2019, 2:12 PM Reply Quote 0
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