https://lists.ubuntu.com/archives/kernel-team/2017-March/082895.html
** Also affects: linux (Ubuntu Yakkety) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Zesty) Importance: Undecided Assignee: Taco Screen team (taco-screen-team) Status: New ** Changed in: linux (Ubuntu Zesty) Status: New => Fix Released ** Changed in: linux (Ubuntu Zesty) Assignee: Taco Screen team (taco-screen-team) => (unassigned) ** Changed in: linux (Ubuntu Yakkety) Status: New => In Progress ** Changed in: linux (Ubuntu Yakkety) Assignee: (unassigned) => Tim Gardner (timg-tpi) ** Changed in: linux (Ubuntu Zesty) Status: Fix Released => Fix Committed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1670726 Title: h-prod does not function across cores Status in linux package in Ubuntu: Fix Committed Status in linux source package in Yakkety: In Progress Status in linux source package in Zesty: Fix Committed 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670726/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp