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    Slow multicast

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    • coco65C
      coco65
      last edited by coco65

      Is it normal for a multicast deploy session to be 30x slower then a “normal” deploy? Hope not. Maybe something is not right. I tried with the same (one) laptop, same image, same server, everything the same. Compression was set at 4.
      PS unicast deploy goes really fast, probably at the max my hardware is capable of. Windows 10 deployment in 3 minutes, I like that…

      0_1468575042070_fog header.jpg
      0_1468575217373_fog multicast slow.jpg

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      • Q
        Quazz Moderator
        last edited by

        Multicast has a little bit of overhead, but not that much.

        I’ve seen around 2.8GB/min on Dell Vostro 1220 (Celeron CPU, weak ass hard drives), so your speeds are definitely abnormal.

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        • Tom ElliottT
          Tom Elliott
          last edited by

          Multicast is it’s own beast. Especially if you’re running multicast over the same network as all the rest of your traffic.

          If I deploy two systems at the same time via multicast, I get about 1.25 GB/Min (or just about 100Mbps). Where I might get 3GB/Min (or just about 200Mbps) if I ran the exact same image to two separate machines.

          I don’t know your environment so I’m unable to see why/what’s going on to cause such a large impact.

          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! Get in contact with me (chat bubble in the top right corner) if you want to join in.

          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

          coco65C 1 Reply Last reply Reply Quote 0
          • coco65C
            coco65 @Tom Elliott
            last edited by

            @Tom-Elliott : The test was done at home, both the fog server (running on Debian in a Hyper-V virtual server) and the laptop are connected to Gb switch. There was almost zero network load during the tests. With unicast (normal deploy) I got 3 Gb/min. With multicast (to 1 client, the same laptop) I got not even 200 Mb/min. The firewall in Debian is turned off. Could the difference be because of Hyper-V? Next week at work I can try it in a different environment. Here is a photo during multicast deploy;
            0_1468579152241_IMG_0809.JPG

            Tom ElliottT 1 Reply Last reply Reply Quote 0
            • Tom ElliottT
              Tom Elliott @coco65
              last edited by

              @coco65 It could be any number of things. I do, however, believe Hyper-V may be the largest cause at this point. Can you try a multicast image to a physical machine?

              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! Get in contact with me (chat bubble in the top right corner) if you want to join in.

              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

              coco65C 1 Reply Last reply Reply Quote 0
              • coco65C
                coco65 @Tom Elliott
                last edited by

                @Tom-Elliott : The test I did was from a virtual server (Debian 8 inside Hyper-V) to a physical machine (a laptop). See the report picture above, “Acer” is the brand of the laptop.

                Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                • Wayne WorkmanW
                  Wayne Workman @coco65
                  last edited by Wayne Workman

                  @coco65 Since this was at home, I’m guessing you were using a consumer grade underpowered switch - or worse - the integrated switch on a AP/Switch/Router combination device.

                  Those devices can do Multicast because they can forward broadcast traffic correctly - but their onboard chips don’t have the power to replicate such heavy broadcast traffic to all ports - so things slow way down.

                  You won’t see such bad performance on a Cisco Catalyst 1Gbps switch.

                  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/

                  coco65C 2 Replies Last reply Reply Quote 0
                  • coco65C
                    coco65 @Wayne Workman
                    last edited by

                    @Wayne-Workman : At the moment I am using a tplink 8-port switch. Just ordered a netgear pro 8 port managed switch, let’s see if it goes better with that.

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                    • coco65C
                      coco65 @Wayne Workman
                      last edited by

                      @Wayne-Workman : You were right. I built the following: a physical fog server (a laptop) connected to a netgear pro switch, capture and deploy an other laptop, first with unicast then with multicast. Now there is almost no difference in deployment time, multicast takes about 20 seconds longer. Nothing else was connected to the test-network.

                      Conclusion: a good switch does make a difference. Thanks for the tip.

                      I wonder if the compression factor used makes a big difference in speed. Storage is cheap, time is money… Going to test that next.

                      Wayne WorkmanW 1 Reply Last reply Reply Quote 2
                      • Wayne WorkmanW
                        Wayne Workman @coco65
                        last edited by Wayne Workman

                        @coco65 There’s been research in the area of FOG’s compression and delivery times.

                        The conclusion - 5 to 7 is best.

                        Read here:
                        https://wiki.fogproject.org/wiki/index.php?title=Image_Compression_Tests

                        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/

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