JDK-7037812 : few more defaults changes for new AMD processors
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: hs21
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: x86
  • Submitted: 2011-04-19
  • Updated: 2011-07-29
  • Resolved: 2011-05-10
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JDK 7 Other
7Fixed hs21Fixed
Related Reports
Relates :  
JDK-7108221 - Backport to jdk6 Hotspot defaults for AMD Bulldozer processor
Description
Please review this patch which changes a few more defaults for the AMD family 15h processors. The webrev is at

http://cr.openjdk.java.net/~tdeneau/bd-defaults-part2/webrev.01/

   * A previous patch made the default AllocationPrefetchStyle
     style 0 (no prefetch).  Here we add that if a different style
     is specified and a prefetch instruction type is not explicitly specified,
     the default prefetch instruction will be PREFETCHW.

   * UseXMMForArrayCopy and UseUnalignedLoadStores default to true

-- Tom Deneau, AMD
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/2a34a4fbc52c
05-05-2011
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/2a34a4fbc52c
19-04-2011