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Re: [Xen-devel] Xen (both x86 and Arm) Community Call: Feb 13 - 16:00 - 17:00 UTC - Call for Agenda Items

On Feb 11, 2019, at 05:05, Lars Kurth <lars.kurth.xen@xxxxxxxxx> wrote:

Hi all, 

we have the community call for February coming up this Wednesday. My sincere apologies, that I have not asked for agenda items last week. A current agenda (primarily a skeleton) is available at  https://docs.google.com/document/d/15ZLzQcH794jufDZW1oNYVY2D12CnVqxQ-klFAqkd2bU/edit#heading=h.mz1wjb9vekjn

Please propose topics by either editing the running agenda document at https://docs.google.com/document/d/1Ufv9XcQO0zIAVeFbFCAHAeEIB9Ap4Y4srAm4vI8I01I/edit# or by replying to the mail. Ideally by a few hours before the meeting!

Proposed agenda items:

1.  Tailored instances of Xen: continuing the Nov 2018 discussion of KCONFIG/L0  hypervisor use cases.  More details upcoming via wiki page.

2.  Macro supply chains:  what are best practices for maintaining Xen macros which originate in other open-source communities, e.g. QEMU or Linux?  Would each macro benefit from a documented status (e.g. "Ignore upstream changes", "Monitor upstream changes", "Mirror upstream changes") with associated tooling?

3. Go toolchain:  is there community interest in collaborating on the development of golang tools for local management of Xen?  Historically, OpenXT used a combination of Haskell and Ocaml tools.  Some OpenXT community members are using golang with Xen. Could these new tools find a home in upstream Xen?

4. NVME passthrough performance: this is improved when VMEXITs are avoided by using "posted interrupts" [1] available on Broadwell and later Xeon processors or AWS nested hypervisor "metal" [2].  For commodity x86 CPUs which do not have posted interrupts, Linux [3] and Hyper-V [4] have used "hybrid polling" to achieve good I/O performance at the cost of CPU cycles.  Is this applicable to Xen?


[1] "VT-d Posted Interrupts" - Intel, 2012

[2] Running Thousands of KVM Guests on Amazon i3.metal Instances, twosix, 2017

[3] "I/O Latency Optimization with Polling" - Western Digital, 2017

[4] "Achieving 10-Million IOPS from a single VM on Windows Hyper-V" - MS, 2018

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