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

@mickwilli Hi, here are some more suggestions after discussing with the team: Try rebooting the host first; Try using the following commands to change the guest TSC mode: xe vm-param-add uuid=(VM UUID) param-name=platform tsc_mode=2 xe vm-param-add uuid=(VM UUID) param-name=platform nomigrate=true Then try reenabling Viridian

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

@andSmv Any news on a test build with the patch? I'm wondering if this issue is related and would love to be able to test.

@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.

@dinhngtu said in Epyc VM to VM networking slow: @Forza There's a new script here that will help you check the VM's status wrt. the Fix 1. Thank you. It does indeed look like the EPYC fix is active in XOA. [07:25 22] xoa:~$ python3 epyc-fix-check.py 'xen-platform-pci' PCI IO mem address is 0xFB000000 Grant table cacheability fix is ACTIVE. Has Vates checked if a newer kernel would help the network performance with XOA? Current kernel is: linux-image-amd64/oldstable,now 6.1.148-1 amd64 [installed] When trying to install any of the newer kernels (6.12.43-*) it immediately fails dependency check: [07:30 22] xoa:~$ apt install linux-image-6.12.43+deb12- linux-image-6.12.43+deb12-amd64 linux-image-6.12.43+deb12-cloud-amd64-unsigned linux-image-6.12.43+deb12-amd64-dbg linux-image-6.12.43+deb12-rt-amd64 linux-image-6.12.43+deb12-amd64-unsigned linux-image-6.12.43+deb12-rt-amd64-dbg linux-image-6.12.43+deb12-cloud-amd64 linux-image-6.12.43+deb12-rt-amd64-unsigned linux-image-6.12.43+deb12-cloud-amd64-dbg [07:30 22] xoa:~$ apt install linux-image-6.12.43+deb12-amd64 Reading package lists... Done Building dependency tree... Done Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: linux-image-6.12.43+deb12-amd64 : PreDepends: linux-base (>= 4.12~) but 4.9 is to be installed E: Unable to correct problems, you have held broken packages.

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!

@AtaxyaNetwork Did try to change those files and add the missing drivers, but couldn't get it to work with plugins. I think I will just have a look at you image when I have it and see what I am missing

You are welcome Enjoy XCP-ng/XO!

so it seems like when i make the igpu pass through, i see the starting lines of xcp-ng but it never gets to the console screen. which is what i expect. When I add the pcie devices (igpu/hdmi audio) to a vm and start it up, I get and update to the screen and it shows a red number counting which is part of the console. So it seems that when the VM re-initializes the igpu, dom/xcp retakes it over. I confirmed that by using the keyboard to move around and it reshowing the console and filling the missing details as i move around. So why is the dom/xcp retaking the video device over again when it should be blocked from accessing it? [image: 1756568880819-img_3348.jpeg]

@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.