Epyc VM to VM networking slow
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Hello everyone!
Great news, now you have something to test: https://xcp-ng.org/forum/topic/10943/network-traffic-performance-on-amd-processors
Please go there, follow instruction carefully and report please!
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@olivierlambert This is great, thanks for letting us know! I'll give this a shot in my lab as soon as I can.
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The fix, which was proposed as a test to resolve some of the issues encountered, has been integrated into an official update candidate which will be released to everyone next time we publish updates. For more information on this update, you can consult the following post: https://xcp-ng.org/forum/post/96135
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Hello!
First of all thank you very much for providing the fix!Following the blog post https://xcp-ng.org/blog/2025/09/01/september-2025-maintenance-update-for-xcp-ng-8-3/:
The change only affects Linux guests. To make it effective, their kernel must support the feature which enables this fix. Linux distributions that have recent enough kernels or apply fixes from the mainline LTS kernels support it. Older ones don't (example: Ubuntu 20.04). Some currently supported LTS distros don't have the required patch yet, notably RHEL 8 and 9 and their derivatives. This might change if we can convince them to apply the patch to their kernel.
Where can we find the list of the supported OS and kernels to run some?
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Because that would be a pretty big list. Which distros you have in mind?
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@olivierlambert we are using Oracle Linux, is OEL8/9/10 supported? As I understand OEL8 and 9 do contain a fix. We can also try with any other OS suggested by you. Thanks!
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Question for @Team-Hypervisor-Kernel
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OEL 8 & 9 wouldn't contain the fix unless they applied extra patches for this to the RHEL 8 & 9 kernel(s). I'll let the hypervisor team check the current status.
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kernel-4.18.0-553.71.1.0.1.el8_10(OL8) andkernel-5.14.0-570.37.1.0.1.el9_6(OL9) do not contain the fix.kernel-6.12.0-55.29.1.0.1.el10_0(OL10) does. -
