kernel-packages team mailing list archive

[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-xenial

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https://bugs.launchpad.net/bugs/1592481

Title:
  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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