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There is a performance problem issue with h-prod. I can see that h-prod
calls are only waking hardware threads from a h-cede call when the
caller is on the same core as the thread being awoken (sibling theads).
For cross core prods the target thread remains in h-cede until its next
decrementer interrupt. That is causing guest OS some significant
dispatching delays.
The fix is now upstream as commit 8464c8842de2 ("KVM: PPC: Book3S HV:
Fix H_PROD to actually wake the target vcpu", 2016-12-06) in v4.11-rc1.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-152309 severity-high
targetmilestone-inin16042
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h-prod does not function across cores
https://bugs.launchpad.net/bugs/1670726
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