** Changed in: linux (Ubuntu Yakkety)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1670726
Title:
h-prod does not function across cores
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Yakkety:
Fix Committed
Status in linux source package in Zesty:
Fix Released
Bug description:
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.
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