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[Bug 1592481] [NEW] VMX kernel crypto module exhibits poor performance in Ubuntu 16.04


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---Problem Description---
Pre-sales customer with loaner P8 observes slow performance of VMX-accelerated kernel crypto, multiple times slower then Haswell.
---uname output---
Linux crimini9 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:30:22 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux
Machine Type = unknown 
---Steps to Reproduce---
 Run cryptsetup benchmark with the VMX crypto module modprobed.
Original customer cryptsetup benchmark results on Ubuntu 16.04:
Intel i5 core 2500k overclocked at 4.5 GHz w/ 4 cores:
aes-xts   256b  1884,2 MiB/s  1952,0 MiB/s
aes-cbc  256b   509,1 MiB/s  1724,2 MiB/s
Results for xeon e5-2680 at 2.80 Ghz:
 aes-cbc   256b   392.6 MiB/s  2062.0 MiB/s
 aes-xts   256b  3853.0 MiB/s  4793.0 MiB/s
Results from intel i7 3770 at 3.40 GHz:
aes-xts?? 256b??7787.0 MiB/s??7962.0 MiB/s
aes-cbc?? 256b?? 662.0 MiB/s??3779.0 MiB/s
Power 8 at 4.15Ghz and vmx-crypto loaded (s822L, 16c, powervm)
aes-xts   256b   410.7 MiB/s   413.9 MiB/s
aes-cbc   256b   300.6 MiB/s   358.7 MiB/s

Mirroring to Canonical for their awareness as IBM purses a fix for
inclusion in a 16.04 SRU.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New

** Tags: architecture-ppc64le bugnameltc-142541 severity-critical targetmilestone-inin16041
VMX kernel crypto module exhibits poor performance in Ubuntu 16.04
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