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Use ptp_kvm as an NTP time source on qemu when available #1433

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jlebon opened this issue Mar 3, 2023 · 5 comments
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Use ptp_kvm as an NTP time source on qemu when available #1433

jlebon opened this issue Mar 3, 2023 · 5 comments
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@jlebon
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jlebon commented Mar 3, 2023

Describe the enhancement

There's a ptp_kvm kernel module that allows the guest to be in sync with the host. There's a proposal in coreos/fedora-coreos-config#2263 to make use of it and a subproposal to make "partial use" of it (see coreos/fedora-coreos-config#2263 (comment)).

Since the PR already has all the context, please keep discussions there.

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@coreos coreos locked and limited conversation to collaborators Mar 3, 2023
@jlebon jlebon added the meeting topics for meetings label Mar 3, 2023
@dustymabe
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We discussed this in the community meeting today.

12:24:31   jlebon | #agreed we will make chrony take ptp_kvm as an additional source if
                  | it's found to be accurate enough. we will add a test verifying that
                  | this setup works.

@dustymabe dustymabe added status/decided status/pending-action Needs action and removed meeting topics for meetings labels Mar 8, 2023
@jlebon jlebon added the meeting topics for meetings label Mar 29, 2023
@dustymabe
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We discussed this in the community meeting today.

12:55:27  jlebon | #agreed we will keep PEERNTP=yes on QEMU so
                 | that DHCP-provided NTP servers are still
                 | considered even if ptp_kvm is available

@dustymabe dustymabe removed the meeting topics for meetings label Mar 29, 2023
@dustymabe dustymabe changed the title Should the QEMU image use ptp_kvm where available by default? Use ptp_kvm as an NTP time source on qemu when available Apr 4, 2023
@dustymabe dustymabe added status/pending-testing-release Fixed upstream. Waiting on a testing release. status/pending-next-release Fixed upstream. Waiting on a next release. and removed status/decided status/pending-action Needs action labels Apr 4, 2023
@dustymabe
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The fix for this went into next stream release 38.20230402.1.0. Please try out the new release and report issues.

@dustymabe
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The fix for this went into testing stream release 37.20230401.2.0. Please try out the new release and report issues.

@dustymabe dustymabe added status/pending-stable-release Fixed upstream and in testing. Waiting on stable release. and removed status/pending-testing-release Fixed upstream. Waiting on a testing release. status/pending-next-release Fixed upstream. Waiting on a next release. labels Apr 6, 2023
@dustymabe
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The fix for this went into stable stream release 37.20230401.3.0.

@dustymabe dustymabe removed the status/pending-stable-release Fixed upstream and in testing. Waiting on stable release. label Apr 18, 2023
c4rt0 pushed a commit to c4rt0/fedora-coreos-config that referenced this issue May 17, 2023
@karelvanhecke @jlebon @c4rt0
coreos-platform-chrony-config: use ptp_kvm when available on QEMU
11c6dc3 
KVM supports a `ptp_kvm` kernel module which allows the guest to query
the host clock for synchronization purposes.

Configure chrony to make use of it if it's available.

Don't disable the default pool; it'll be used by chrony to determine
whether the host clock is accurate or a falseticker.

Don't disable `PEERNTP` as we do on other platforms since we
historically haven't done so on QEMU and it's possible users have been
using their own DHCP servers (e.g. dnsmasq) to feed NTP configuration.

Closes: coreos/fedora-coreos-tracker#1433

Co-authored-by: Jonathan Lebon <jonathan@jlebon.com>
HuijingHei pushed a commit to HuijingHei/fedora-coreos-config that referenced this issue Oct 10, 2023
@karelvanhecke @jlebon @HuijingHei
coreos-platform-chrony-config: use ptp_kvm when available on QEMU
60e419a 
KVM supports a `ptp_kvm` kernel module which allows the guest to query
the host clock for synchronization purposes.

Configure chrony to make use of it if it's available.

Don't disable the default pool; it'll be used by chrony to determine
whether the host clock is accurate or a falseticker.

Don't disable `PEERNTP` as we do on other platforms since we
historically haven't done so on QEMU and it's possible users have been
using their own DHCP servers (e.g. dnsmasq) to feed NTP configuration.

Closes: coreos/fedora-coreos-tracker#1433

Co-authored-by: Jonathan Lebon <jonathan@jlebon.com>
HuijingHei pushed a commit to HuijingHei/fedora-coreos-config that referenced this issue Oct 10, 2023
@karelvanhecke @jlebon @HuijingHei
coreos-platform-chrony-config: use ptp_kvm when available on QEMU
9baa5c9 
KVM supports a `ptp_kvm` kernel module which allows the guest to query
the host clock for synchronization purposes.

Configure chrony to make use of it if it's available.

Don't disable the default pool; it'll be used by chrony to determine
whether the host clock is accurate or a falseticker.

Don't disable `PEERNTP` as we do on other platforms since we
historically haven't done so on QEMU and it's possible users have been
using their own DHCP servers (e.g. dnsmasq) to feed NTP configuration.

Closes: coreos/fedora-coreos-tracker#1433

Co-authored-by: Jonathan Lebon <jonathan@jlebon.com>
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@dustymabe @jlebon