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

From	Cody Zuschlag <cody.zuschlag@xenproject.org>
Newsgroups	linux.debian.kernel
Subject	Request to consider backporting EPYC VM performance patch to Debian 11 (kernel 5.10)
Date	2025-10-31 12:20 +0100
Message-ID	<LLVkJ-9nfH-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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