Apologies for the late response - life got in the way! I tried your tweaks and these appear to have solved the issue. The VM has been stable for over a month, which also included a reboot or two to install updates. Thanks for the help.

@nikade This is not related to Dom0 RAM. It's related to the host RAM.

Yay! Santa came early this year!!

@hitechhillbilly no it doesn't, it just ensures the N-th vCPU of Dom0 only runs on N-th pCPU of the machine. Not sure about the practical impact of it, in the past it has been used for getting meaningful CPU temperatures from coretemp (with physical core matching virtual one), but that doesn't work anymore since Xen filters MSR accesses (including Dom0).

@firereverie Sorry, these last few weeks was very-very busy. So I REALLY hope will do something on this before the december end and come back to you.

Hi, I can't tell it's the cause, but you should first use an officially supported client to manage it.

@isdpcman-0 said in Install mono on XCP-ng: Our RMM tools will run on CentOS but fail to install because they are looking for mono to be on the system. How can I install Mono on an XCP-ng host so we can install our monitoring/management tools? Reply I think it is advised to consider hosts as appliances and not install any external packages (repos are disabled for that purpose, that's probably your issue for installing anything) even in case of clusters of many hosts in a pool, you should deploy same packages on all hosts to expect compliancy between hosts... better use SNMP to monitor you hosts ? or standard installed packages ?

Ah nice!

@gduperrey said in How to Install XCP-ng Guest Tools on Rocky Linux 10?: but I don't have a release date yet, even for testing Actually it's already available as xcp-ng-pv-tools in the xcp-ng-incoming repository. What Gaël means is that we haven't run CI on it yet, so we haven't moved the package to the testing repository yet, which is when we usually invite users to test. However here I'm able to say that there's no risk in installing it now for testing, with: yum update xcp-ng-pv-tools --enablerepo=xcp-ng-incoming,xcp-ng-ci,xcp-ng-testing,xcp-ng-candidates (the testing repos will only be enabled for the time of the command, not permanently)

Thanks a lot for this In few months ago I have found your topic to try wazuh, and it is working good. After some error on my home lab, I need to install all again and remember your topic. On my installation, I just need to set /dev/xvda1 (if I just put /dev/xvda, VM not start). My home lab is on ProLiant DL360 Gen9.

Yes, and then Xen will reduce the RAM if there's not enough available to boot a new VM (reducing down to dynamic min). Static means it can't be changed live, while dynamic can.

So I actually posted these findings to the ZFSBootMenu Discussion github: https://github.com/zbm-dev/zfsbootmenu/discussions/787 Looks like they have tested ZBM against KVM but not Xen. Can Xen not handle a kernel being kexec'd?

@Forza I keep hoping to see an Alpha or Beta of XCP-ng 9 soon, but I think there is still a lot of work to be done on the host side and on the Xen Orchestra 6 side.

@Bill.Oliver license-wise should be the same. now I think virtualisation gurus here could try to explain you what are the challenges with numa and dual sockets i have notions, but couldnt explain quite the optimisation in xen

@andriy.sultanov Hi, I am having the same issue. Many PCIe USB cards aren't showing up in XO. Any updates if/when this might be fixed? Being able to configure PCIe passthough from the web UI is a really useful new feature and it would be really cool to be able to fully make use if it. Below as requested my list of items that don't show up: 00:00.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Root Complex [1480]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 00:00.2 "IOMMU [0806]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse IOMMU [1481]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 00:01.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:01.1 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse GPP Bridge [1483]" "" "" 00:01.2 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse GPP Bridge [1483]" "" "" 00:02.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:03.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:03.1 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse GPP Bridge [1483]" "" "" 00:03.2 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse GPP Bridge [1483]" "" "" 00:04.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:05.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:07.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:07.1 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1484]" "" "" 00:08.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Host Bridge [1482]" "" "" 00:08.1 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1484]" "" "" 00:14.0 "SMBus [0c05]" "Advanced Micro Devices, Inc. [AMD] [1022]" "FCH SMBus Controller [790b]" -r61 "ASUSTeK Computer Inc. [1043]" "Device [87c0]" 00:14.3 "ISA bridge [0601]" "Advanced Micro Devices, Inc. [AMD] [1022]" "FCH LPC Bridge [790e]" -r51 "ASUSTeK Computer Inc. [1043]" "Device [87c0]" 00:18.0 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 0 [1440]" "" "" 00:18.1 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 1 [1441]" "" "" 00:18.2 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 2 [1442]" "" "" 00:18.3 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 3 [1443]" "" "" 00:18.4 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 4 [1444]" "" "" 00:18.5 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 5 [1445]" "" "" 00:18.6 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 6 [1446]" "" "" 00:18.7 "Host bridge [0600]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse/Vermeer Data Fabric: Device 18h; Function 7 [1447]" "" "" 02:00.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse Switch Upstream [57ad]" "" "" 03:01.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:02.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:03.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:04.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:05.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:06.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a3]" "" "" 03:08.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a4]" "" "" 03:09.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a4]" "" "" 03:0a.0 "PCI bridge [0604]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse PCIe GPP Bridge [57a4]" "" "" 05:00.0 "USB controller [0c03]" "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" -r03 -p30 "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" 06:00.0 "USB controller [0c03]" "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" -r03 -p30 "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" 07:00.0 "USB controller [0c03]" "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" -r03 -p30 "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" 09:00.0 "USB controller [0c03]" "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" -r03 -p30 "Renesas Technology Corp. [1912]" "uPD720201 USB 3.0 Host Controller [0014]" 0a:00.0 "Non-Essential Instrumentation [1300]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Reserved SPP [1485]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 0a:00.1 "USB controller [0c03]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse USB 3.0 Host Controller [149c]" -p30 "ASUSTeK Computer Inc. [1043]" "Device [8808]" 0a:00.3 "USB controller [0c03]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse USB 3.0 Host Controller [149c]" -p30 "Advanced Micro Devices, Inc. [AMD] [1022]" "Device [148c]" 10:00.0 "Non-Essential Instrumentation [1300]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse PCIe Dummy Function [148a]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 11:00.0 "Non-Essential Instrumentation [1300]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Reserved SPP [1485]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 11:00.1 "Encryption controller [1080]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse Cryptographic Coprocessor PSPCPP [1486]" "ASUSTeK Computer Inc. [1043]" "Device [8808]" 11:00.3 "USB controller [0c03]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Matisse USB 3.0 Host Controller [149c]" -p30 "ASUSTeK Computer Inc. [1043]" "Device [87c0]" 11:00.4 "Audio device [0403]" "Advanced Micro Devices, Inc. [AMD] [1022]" "Starship/Matisse HD Audio Controller [1487]" "ASUSTeK Computer Inc. [1043]" "Device [8733]" Most important ones being the PCIe USB cards: 05:00.0, 06:00.0, 07:00.0, 09:00.0. Thanks for looking into fixing this.

@acebmxer thank you for testing and confirming! For those who try this... NOTE WSL 1 has the issue of throwing the error Failed to take /etc/passswd lock: Invalid argument https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2069555/comments/12 Here is a fix sudo sed -i -e '/systemd-sysusers/s/.conf$/.conf || true/' /var/lib/dpkg/info/*.postinst sudo apt --fix-broken install

Hi, Let me ask @Team-Hypervisor-Kernel

@Maelstrom96 said in Epyc VM to VM networking slow: What is the exact kernel patch that is required for the xen-platform-pci-bar-uc=false fix to work on a Linux guest? We're looking at potentially compiling our own kernel with the xen-netfront.c patch, and we would like to see about adding the other part of the Kernel code needed for the Grant table fix. Patch is in Linux since 5.19-rc. You also find it in some stable branches like 5.15. Otherwise, you can check this patch https://lore.kernel.org/xen-devel/ea4945df138527ed63e711cb77e3b333f7b3a4c9.1751633056.git.teddy.astie@vates.tech/

New version release ! A new patch version of the OME appliance is now available [image: 1761814461561-606721a0-e549-47b3-8b69-55d7b233d21f-image-resized.png] What I changed: Add xen-blkfront and xen-netfront driver Add guest tool (so RAM/network is reported, soft shutdown is working) /dev/sd* is replaced by /dev/xvd* Remove grub password Change admin and root password SSH is now enabled SElinux is working correctly DHCP is enabled by default As usual, please send a DM if you want the link to the vhd Feedback is welcome !