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Re: Request to consider backporting EPYC VM performance patch to Debian 11 (kernel 5.10)

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Hello again,

Just a gentle follow-up on the request below about the EPYC VM performance
patch for Debian 11’s 5.10 kernel.

If this is something you’d consider, I’m happy to open a bug against the
linux source package and track it there, or provide more details about the
Xen/XCP-ng side and performance impact on AMD EPYC systems running Xen or
KVM (with Xen emulation).

Please let me know what the preferred next step would be.

Best regards,


Cody Zuschlag
Xen Project - Community Manager


On Fri, Oct 31, 2025 at 11:33 AM Cody Zuschlag <cody.zuschlag@xenproject.org>
wrote:

> Hello Debian Kernel Team,
>
> I'm the Community Manager for the Xen Project. I'm writing on behalf of
> the Xen Project community regarding a Linux kernel patch that improves
> virtual-machine performance on AMD EPYC systems running Xen or KVM (with
> Xen emulation).
>
> The patch addresses a communication-performance issue between VMs on the
> same host. A workaround already exists downstream, but inclusion in Debian
> 11’s 5.10 kernel would ensure stable performance without manual
> adjustments. Greg KH declined to backport the series to 5.10 stable as it’s
> a performance improvement rather than a bug fix, but it has proven reliable
> in testing.
>
> Patch reference:
> - Mainline patch by Juergen Gross (SUSE)
> <https://lore.kernel.org/all/20220530082634.6339-1-jgross@suse.com/>
> or its backport:
> - Backport by Teddy Astie (Vates)
> <https://lore.kernel.org/all/4cc9c1f583fb4bfca02ff7050b9b01cb9abb7e7f.1756803599.git.teddy.astie@vates.tech/>
>
> Would you consider integrating this patch into Debian 11’s kernel?
> Please let us know if you prefer that we open a bug for tracking.
>
> Very best regards,
>
> Cody Zuschlag
> Xen Project - Community Manager
>

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Thread

Request to consider backporting EPYC VM performance patch to Debian  11 (kernel 5.10) Cody Zuschlag <cody.zuschlag@xenproject.org> - 2025-10-31 12:20 +0100
  Re: Request to consider backporting EPYC VM performance patch to  Debian 11 (kernel 5.10) Cody Zuschlag <cody.zuschlag@xenproject.org> - 2025-11-13 17:10 +0100
    Re: Request to consider backporting EPYC VM performance patch to  Debian 11 (kernel 5.10) Salvatore Bonaccorso <carnil@debian.org> - 2025-11-14 22:50 +0100
  Re: Request to consider backporting EPYC VM performance patch to  Debian 11 (kernel 5.10) Bastian Blank <waldi@debian.org> - 2025-11-13 17:50 +0100

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