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 !

Happy to get your logs to get on the bottom of this. Sadly, we don't have a CM7 around so we cannot reproduce. Thank you very much for the feedback!

@Forza Yes it can This is how I do it https://xcp-ng.org/forum/topic/10834/apcupsd-install/9

Hi, I don't know if my question can be part of this thread. I apologize in advance... I bought a new system based on "AMD Ryzen 9 9950X" installed on "ASUS PRIME B850-PLUS-CSM". My target is to install two VM: linux based Ubuntu; Windows 11 In a possible future, I would like to install a graphic card for windows 11 CAD applications... I would like to ask if xcp-ng can run this environment... Thank you Claudio

@olivierlambert Beyond 'Did you try rebooting it?', I think 'Have you updated to the latest version?' is the second hard and fast rule all IT people should follow. I suspected the problem was that I was a few releases behind, so I ran an update. It brought the software to 5.109, though I didn't check the blog release page to confirm if I was in fact on the latest. I can finally sleep well tonight!

I believe this was a bug that was fixed in later versions: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX678047

I get ~510MiB on DL380 G10, 2.6ghz, 40gbe cx3, 8.3.

@Chemikant784 It's likely that both Microsoft and Xen tools are a combination of the fix, I doubt XCP-ng has anything to do with this issue. And I never had time to check the XCP-ng Guest tools for Windows to see if this happened, but I'm guessing no or not tested. All my hosts are now on XCP-ng 8.3 and I don't see any point in testing 8.2 since it is EOL. And that said, I'm no farther along in my Server 2025 testing, too many other things going on to think about it right now. If I have time I need to burn the vSphere portion of my lab down and install either Harvester HCI or Windows Server for Hyper-V. Broadcom is just (seemingly) going out of their way to prevent people like me (or us) from learning their products and using them in our labs to further that goal. I've explained this several times to VMUG Advantage managers, but they seem so tied up in clawing out some continuing relationships with Broadcom that they will not "rock the boat". I've said these things in Broadcom webcasts as well, always a run-around with no answers. Sorry for the rant. All that said, eagerly awaiting XCP-ng 9, unfortunately I think the Alpha or Beta may wait until XO 6 is finished (just a guess). The updated kernel brings with it some storage changes that I really want to test, NFS nconnect=XX being one of them to see if I can get a little better performance to/from the disks. ESXi default was nconnect=4 and the VMs were slightly faster to/from their disks (all thin provisioned). The 4k "block" size and smaller is what I want to improve in all this.

Try to disconnect/shutdown XO, and see if your Windows VM still restart every 10-15min.

@edisoninfo Great! This warning is a life saver and did perfectly its job, allowing you to discover a hidden issue Glad you found the root cause!

You are welcome Enjoy XCP-ng/XO!

@chicagomed said in Passthrough Contention Problems with Console and Linux VM: @TeddyAstie great will take a look this weekend. Is there anything in particular you want us to test / check out? What works/doesn't work and overall performance.

Hi, Small side note: lately I’ve noticed that some posts look like they were generated by LLMs. This can actually make it harder for the community to help, because the text is often long, unclear, or missing the basic details we really need to assist. I’d really encourage everyone to write posts in their own words and share as much relevant information as possible. The real value of this community is people helping each other directly

@roaringsilence Glad you got it all sorted out.

@olivierlambert I 100% agree its vague. I even told the person that. Like I was saying I was more looking for anyone who has ran a cluster in those other scheduler settings to get some feedback on it. I guess being a little more specific, would socket or Core be better for VMs that are NUMA sensitive? Such as database servers or the like?