** Information type changed from Proprietary to Public

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Tags added: kernel

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https://bugs.launchpad.net/bugs/1745899

Title:
  [Bug][KVM][Crystal Ridge] Terrible performance of vNVDIMM on QEMU with
  device DAX backend

Status in intel:
  New
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Bionic:
  Triaged

Bug description:
  Description:
  When device DAX (e.g., /dev/daxX.Y) is used as QEMU vNVDIMM backend, its 
performance in guest is far behind the performance on bare metal.

  Commit Ids:
  aa2e063aea79 b8d7044bcff7 (which is in KVM branch instead of mainline kernel)
  Target kernel:4.16
  Target Release:18.04

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