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


** Changed in: linux (Ubuntu Xenial)
       Status: In Progress => Fix Committed

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  VMX kernel crypto module exhibits poor performance in Ubuntu 16.04

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  In Progress

Bug description:
  ---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.

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