Ubuntu 18.04 - Performance: Radix page fault handler bug in KVM
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
The Ubuntu-power-systems project |
Fix Released
|
Critical
|
Canonical Kernel Team | ||
linux (Ubuntu) |
Fix Released
|
Critical
|
Unassigned | ||
Bionic |
Fix Released
|
Critical
|
Unassigned |
Bug Description
== Comment: #0 - JENIFER HOPPER <email address hidden> - 2018-02-27 17:25:59 ==
+++ This bug was initially created as a clone of Bug #165215 +++
---Problem Description---
Paul Mackerras has posted a fix to a Radix page fault handler bug in KVM:
http://
" KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler "
This is critical for P9 KVM performance. Using an open source database workload, we saw an 11% throughput improvement with this patch when the guest was backed w/ 2MB hugepages. Without this patch, hugepage backing does not help performance compared to base page size.
---uname output---
18.04 lts
Machine Type = 5104-22C
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Back guest w/ 2MB pages, run a throughput test and compare performance.
Contact Information = <email address hidden>
CVE References
affects: | kernel-package (Ubuntu) → linux (Ubuntu) |
Changed in ubuntu-power-systems: | |
status: | New → Triaged |
importance: | Undecided → Critical |
assignee: | nobody → Canonical Kernel Team (canonical-kernel-team) |
tags: | added: kernel-da-key triage-g |
Changed in ubuntu-power-systems: | |
status: | Triaged → Incomplete |
tags: |
added: targetmilestone-inin1804 removed: targetmilestone-inin--- |
Changed in linux (Ubuntu): | |
importance: | Undecided → Critical |
status: | New → Triaged |
Changed in linux (Ubuntu Bionic): | |
assignee: | Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Bionic): | |
status: | Triaged → In Progress |
Changed in ubuntu-power-systems: | |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
Changed in ubuntu-power-systems: | |
status: | In Progress → Fix Committed |
tags: | removed: bugnameltc-165216 kernel-da-key severity-critical triage-g |
tags: | added: triage-g |
Changed in ubuntu-power-systems: | |
status: | Fix Committed → Fix Released |
tags: | added: bugnameltc-165216 severity-critical |
tags: | added: cscc |
------- Comment From <email address hidden> 2018-02-28 00:16 EDT-------
note, patch is not upstream yet, it was just posted..will update commit id once it's accepted in upstream