Non-server CPU compatibility - Ryzen and Intel
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So, we've had reports on xen-devel which look a little like this.
@BlueBadger are you able to switch back to your 7950x and try booting Xen with
x2apic_phys=true? It appears that the -X processors are missing a feature in their IOMMU and Xen was getting confused when setting up interrupt handling.https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=0d2686f6b66b4b1b3c72c3525083b0ce02830054 is at least part of the fix, but so far feedback on the mailing lists suggests it's not a complete fix.
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@andyhhp Thanks for the info.
I plan to leave my current machine (Ryzen 7900) as is since it seems to be running well.
I plan to build a new machine with the extra 7950x. The motherboard is on back order.
I will try the new setting once it is built. -
@andyhhp I built a new machine with my Ryzen 7950x.
Booting Xen with x2apic_phys=true did not seem to fix any issues.
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Interesting, thanks for the feedback. @andyhhp should we provide a Xen version with the initial fix and see if it's better? (maybe combined to the x2apic param)
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I'm testing this combo:
- AMD RYZEN 9 7900X
- ASUS PRIME X670-P WIFI bios 1406
- 2x32GB KINGSTON 5600 CL40 (max QLV)
- Boot drive NVME 250gb (chipset) and SN850X 4.0 1TB on CPU.
With setting: Local APIC Mode = X2APIC and UEFI set to Other OS. Installed 8.3 alpha and updated, got errors. Test installing XOA took too much time and booting was painfully slow using only 1 SSD on chipset NVME.
Tried disabling IOMMU, but the same issue.
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It's possible we got a fix, but we need sometime to generate the right build/RPM for you to test
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@olivierlambert said in Non-server CPU compatibility - Ryzen and Intel:
It's possible we got a fix, but we need sometime to generate the right build/RPM for you to test
I have to identical setups for testing. With all the storage being pcie and interrupts. I also got a instlall with proxmox, but kind of same issues with IOMMU, trying to passtrough the 4.0 nvme. The disk was very slow, CPU wise performance on W11 machine was great.
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I'm almost sure the future patch will fix the slow CPU behavior
Hang on! -
@olivierlambert said in Non-server CPU compatibility - Ryzen and Intel:
I'm almost sure the future patch will fix the slow CPU behavior
Hang on!Any update on when this fix is available. I got a x series cpu and am having these same problems.
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We need to take a closer look, it's in our backlog but we also have other stuff pending (as you can imagine). Let me ping @stormi about this.
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In theory we now have the relevant patches. We'll try to provide a patched build in the coming days, either this week or the next.
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Awesome! I appreciate it.
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@stormi Good news! if you need some testing to be done, I've a 7900X avaliable for testing.
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Hi everyone!
So, @andSmv applied a few patches to Xen for you and built it.
As it's still only a temporary test build, you will find it in a special user repository at: https://koji.xcp-ng.org/repos/user/8/8.3/asemenov1/x86_64/
You may either add the repository (by creating a .repo file in /etc/yum.repos.d/) and then run
yum update --enablerepo={nameofrepo}, or download the RPMs locally and then runyum update ./xen*.rpm.Please let us know if it fixes issues with your CPUs.
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Yay \o/
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It's looking very good on my 7900X since applying the fixes:
- Rolled back all the "nopv" boot options on Linux VMs (Ubuntu, Mint, Rocky) and they boot quickly.
- Xen Orchestra has its IP address within a minute instead of around 10 minutes
- Xen tools status on the Linux VMs are now showing "installed" (vs "not installed" before fixes)
- No "stuck CPU" messages observed anywhere
What a difference! Thanks!!
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@stormi Everything seem to be running stable. Thanks for the updates and all the hard work. I'm running a Ryzen 7 7700x.
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Thanks for your feedback!
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The patch is now included in the latest updates to XCP-ng 8.3 (see https://xcp-ng.org/forum/post/62263) so you can forget about the test build and just update normally.
For those who installed the test build, it will be automatically replaced when you update.
