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    XCP-ng 8.0.0 Beta now available!

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    • olivierlambertO Offline
      olivierlambert Vates 🪐 Co-Founder CEO
      last edited by

      Yup, but before (0.8) it wasn't good for performances, at all, due to cache poisoning (no O_DIRECT support).

      1 Reply Last reply Reply Quote 1
      • C Offline
        cocoon XCP-ng Center Team
        last edited by

        Any chance to get a newer lsblk that supports json output?
        Would be great for plugins and would make parsing output much easier.

        Currently installed on XCP-ng 8 beta: util-linux-2.23.2-52.el7_5.1.x86_64

        (something later than v2.27?)
        https://git.devuan.org/CenturionDan/util-linux/commit/4a102a4871fdb415f4de5af9ffb7a2fb8926b5d1

        ... ah forget it, I see, CentOS is using the old versions since long time ...

        stormiS 1 Reply Last reply Reply Quote 0
        • stormiS Offline
          stormi Vates 🪐 XCP-ng Team @cocoon
          last edited by

          @cocoon said in XCP-ng 8.0.0 Beta now available!:

          ... ah forget it, I see, CentOS is using the old versions since long time ...

          Yeah the chances that we'd change the version of such a low level package just for added functionality are very low.

          C 1 Reply Last reply Reply Quote 0
          • C Offline
            cocoon XCP-ng Center Team @stormi
            last edited by

            @stormi yes and I totally understand that ... I just thought at first, it is so old, there must be something new if CentOS 7.5 is new ... but no 😕

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            • akurzawaA Offline
              akurzawa
              last edited by

              hi

              Is this possible to install xcp-ng in xcp-ng just for tests?

              borzelB 1 Reply Last reply Reply Quote 0
              • ruskofdR Offline
                ruskofd
                last edited by

                Sure you need to enable Nested Virtualization when you create your VM and that's it.

                1 Reply Last reply Reply Quote 0
                • borzelB Offline
                  borzel XCP-ng Center Team @akurzawa
                  last edited by

                  @akurzawa https://github.com/xcp-ng/xcp/wiki/Testing-XCP-ng-in-Virtual-Machine-(Nested-Virtualization)

                  1 Reply Last reply Reply Quote 1
                  • ruskofdR Offline
                    ruskofd
                    last edited by

                    Just updated my homelab server from XCP-ng 7.6 to XCP-ng 8.0 Beta, so far so good. I also tested the new experimental UEFI mode with Windows VM, seems good too.

                    I also tested the new XOA deployment through the Web interface of my host, perfect !

                    We will see during the following week how it goes 😉

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                    • P Offline
                      peder
                      last edited by

                      It does NOT work to migrate a paravirtualized (PV) CentOS6 machine or a PVHVM CentOS7 between two "servers" with Core i3-3110M CPUs in 8.0beta.
                      C6 throws a "xenopsd, error from emu-manager: Invalid argument" and C7 "xenopsd, error from emu-manager: xenguest Invalid argument".

                      It works on the exact same hardware in 7.6 so that seems to be a new "unsupported old CPU" limitation, unless it's a proper bug in 8.0b.

                      I can migrate a Fedora28 (HVM) on that hardware in 8.0b so it appears to depend on what virtualization method the machine uses.

                      stormiS 1 Reply Last reply Reply Quote 0
                      • stormiS Offline
                        stormi Vates 🪐 XCP-ng Team @peder
                        last edited by

                        @peder Thanks for testing. It confirms our recent findings related to PV guests indeed! We're working on it and will post here once it's fixed.

                        P 1 Reply Last reply Reply Quote 1
                        • P Offline
                          peder @stormi
                          last edited by

                          @stormi Nice to hear, thanks!

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                          • ronan-aR Offline
                            ronan-a Vates 🪐 XCP-ng Team
                            last edited by ronan-a

                            @peder Fixed! This fix will be available (as soon as possible) in a future xcp-emu-manager package.

                            1 Reply Last reply Reply Quote 2
                            • stormiS Offline
                              stormi Vates 🪐 XCP-ng Team
                              last edited by

                              I have updated https://github.com/xcp-ng/xcp/wiki/Test-XCP with lots of new tests for those who need ideas 🙂

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                              • s_mcleodS Offline
                                s_mcleod
                                last edited by s_mcleod

                                Just FYI - I have performed CPU and PGBench benchmarks on XCP-ng 8 beta 1, both with Hyperthreading enabled and disabled when running two identical VMs under different types of low, medium and heavy CPU load.

                                Results are available here: https://github.com/sammcj/benchmark_results/tree/master/xcpng/8/hyperthreading_impact

                                TLDR;

                                • Significant performance decrease (38.7725%) when running multithreaded Sysbench CPU benchmarks in parallel on two VMs when hyperthreading is disabled.

                                • Significant performance decrease (16.96%) when running PGBench under 'normal' load benchmarks in parallel on two VMs when hyperthreading is disabled.

                                • No significant performance decrease when running Phoronix Test Suite's Pybench and OpenSSL benchmarks in parallel on two VMs when hyperthreading is disabled.

                                MajorTomM 1 Reply Last reply Reply Quote 1
                                • stormiS Offline
                                  stormi Vates 🪐 XCP-ng Team
                                  last edited by

                                  yum update will now install the latest xcp-ng-emu-manager that fixes the PV guest migration and brings better debug traces in case of crash of the emu-manager binary. We'd be interested if anyone managed to make a migration fail.

                                  Testing ideas still at https://github.com/xcp-ng/xcp/wiki/Test-XCP

                                  P 1 Reply Last reply Reply Quote 1
                                  • MajorTomM Offline
                                    MajorTom @s_mcleod
                                    last edited by

                                    @s_mcleod Hi, I'd like to do some basic benchmarks (though not on 8.0.0, but 7.6 still) to compare a host before and after disabling SMT (hyper-threading).

                                    I thought I'd use some hints from your document at https://github.com/sammcj/benchmark_results/tree/master/xcpng/8/hyperthreading_impact

                                    But the "Test 2 - Sysbench Multithreaded Prime Benchmark" link (https://github.com/sammcj/benchmark_results/blob/master/xcpng/8/hyperthreading_impact/hyperthreading_impact/test_2_sysbench_prime.md) returns "404 page not found".

                                    Maybe you'd want to correct the link? Thank you!

                                    s_mcleodS 1 Reply Last reply Reply Quote 0
                                    • P Offline
                                      peder @stormi
                                      last edited by

                                      @stormi I just managed to make migration fail using xcp-emu-manager-1.1.1-1 and xcp-ng-generic-lib-1.1.1-1 🙂

                                      I have a PVHVM guest (CentOS7) which has static memory limit = 128M/2G and dynamic = 1G/1G and the migration fails after about 20% with a "xenguest invalid argument"
                                      It works if I set static and dynamic max to the same value.

                                      Migration of a PVHVM Fedora 28 with static 1G/2G and dynamic 1G/1G works so it's possible it's the 128M static min that's part of the problem in the CentOS case.

                                      A PV CentOS6 with static = 512M/2G and dynamic 1G/1G also works.

                                      stormiS 1 Reply Last reply Reply Quote 0
                                      • stormiS Offline
                                        stormi Vates 🪐 XCP-ng Team @peder
                                        last edited by

                                        @peder Thanks! Could you make it fail once again and then produce a bug status report on both hosts with xen-bugtool -y and send the the produced tarballs to the project contact address, or to upload it somewhere temporarily for us to download?

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                                        • olivierlambertO Offline
                                          olivierlambert Vates 🪐 Co-Founder CEO
                                          last edited by

                                          I just made a try here, I can't reproduce with the same guest OS and memory settings.

                                          Are you also doing Xen Storage motion?

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                                          • P Offline
                                            peder @stormi
                                            last edited by

                                            @stormi I've placed the tarballs here https://student.oedu.se/~peder/xcp-ng/
                                            I changed the static min to 512M, to match the Fedora case, but it still failed.

                                            Olivier, I'm not using Xen Storage motion but I am using two old Lenovo L430 Thinkpads as "servers" so that could be part of the problem.

                                            I'll install a new C7 guest and see if the problem persists.

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