K 10
svn:author
V 8
gallatin
K 8
svn:date
V 27
2019-01-22T17:34:53.218495Z
K 7
svn:log
V 835
MFC r341095:

  Use busdma unconditionally in iflib

  - Remove the complex mechanism to choose between using busdma
  and raw pmap_kextract at runtime.   The reduced complexity makes
  the code easier to read and maintain.

  - Fix a bug in the small packet receive path where clusters were
  repeatedly mapped but never unmapped. We now store the cluster's
  bus address and avoid re-mapping the cluster each time a small
  packet is received.

  This patch fixes bugs I've seen where ixl(4) will not even
  respond to ping without seeing DMAR faults.

  I see a small improvement (14%) on packet forwarding tests using
  a Haswell based Xeon E5-2697 v3.  Olivier sees a small
  regression (-3% to -6%) with lower end hardware.

Reviewed by:	mmacy
Sponsored by:	Netflix, Inc
Differential Revision:	https://reviews.freebsd.org/D17901

END