** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1752236
Title:
Ubuntu 18.04 - Performance: Radix page fault handler bug in KVM
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Bug description:
== Comment: #0 - JENIFER HOPPER <[email protected]> - 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://patchwork.ozlabs.org/patch/877033/
" 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 protected]
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