# HG changeset patch
# User kvn
# Date 1300388881 25200
# Node ID 82de9bd880e3d53bc2d2576d105a7c11e5d14627
# Parent  8033953d67ff28e869f2888075ca2680356724cf
7028394: Newer AMD Processor Prefetch Defaults
Summary: This new default has shown improvement across many workloads.
Reviewed-by: kvn
Contributed-by: tom.deneau@amd.com

diff -r 8033953d67ff -r 82de9bd880e3 src/cpu/x86/vm/vm_version_x86.cpp
--- a/src/cpu/x86/vm/vm_version_x86.cpp	Fri Mar 11 22:34:57 2011 -0800
+++ b/src/cpu/x86/vm/vm_version_x86.cpp	Thu Mar 17 12:08:01 2011 -0700
@@ -436,6 +436,13 @@
         UseCountLeadingZerosInstruction = true;
       }
     }
+
+    // On family 21 processors default is no sw prefetch
+    if ( cpu_family() == 21 ) {
+      if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
+        AllocatePrefetchStyle = 0;
+      }
+    }
   }
 
   if( is_intel() ) { // Intel cpus specific settings