[jgardou] 56943: [NTOSKRNL] - Raise system PTE count to 44000 for system with more than 256MB of RAM. - http://www.osronline.com/ddkx/appendix/enhancements5_3oc3.htm claims that winXP supports a 96...

Author: jgardou
Date: Mon Jul 23 00:52:01 2012
New Revision: 56943

URL: http://svn.reactos.org/svn/reactos?rev=56943&view=rev
Log:
[NTOSKRNL]
- Raise system PTE count to 44000 for system with more than 256MB of RAM.
- http://www.osronline.com/ddkx/appendix/enhancements5_3oc3.htm claims that winXP supports
a 960MB-contiguous mapping...

Modified:
    trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
    trunk/reactos/ntoskrnl/mm/ARM3/mminit.c

Modified: trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/miarm.h?r…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] Mon Jul 23 00:52:01 2012
@@ -11,6 +11,7 @@
 #define MI_MIN_PAGES_FOR_NONPAGED_POOL_TUNING   ((255 * _1MB) >> PAGE_SHIFT)
 #define MI_MIN_PAGES_FOR_SYSPTE_TUNING          ((19 * _1MB) >> PAGE_SHIFT)
 #define MI_MIN_PAGES_FOR_SYSPTE_BOOST           ((32 * _1MB) >> PAGE_SHIFT)
+#define MI_MIN_PAGES_FOR_SYSPTE_BOOST_BOOST     ((256 * _1MB) >> PAGE_SHIFT)
 #define MI_MAX_INIT_NONPAGED_POOL_SIZE          (128 * _1MB)
 #define MI_MAX_NONPAGED_POOL_SIZE               (128 * _1MB)
 #define MI_MAX_FREE_PAGE_LISTS                  4
@@ -49,6 +50,8 @@
 #define MM_HIGHEST_VAD_ADDRESS \
     (PVOID)((ULONG_PTR)MM_HIGHEST_USER_ADDRESS - (16 * PAGE_SIZE))
 #define MI_LOWEST_VAD_ADDRESS                   (PVOID)MM_LOWEST_USER_ADDRESS
+
+#define MI_DEFAULT_SYSTEM_PTE_COUNT             50000
 
 #endif /* !_M_AMD64 */
 

Modified: trunk/reactos/ntoskrnl/mm/ARM3/mminit.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/mminit.c?…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] Mon Jul 23 00:52:01 2012
@@ -2108,10 +2108,17 @@
         else
         {
             //
-            // Use the default, but check if we have more than 32MB of RAM
+            // Use the default
             //
             MmNumberOfSystemPtes = 11000;
             if (PageCount > MI_MIN_PAGES_FOR_SYSPTE_BOOST)
+            {
+                //
+                // Double the amount of system PTEs
+                //
+                MmNumberOfSystemPtes <<= 1;
+            }
+            if (PageCount > MI_MIN_PAGES_FOR_SYSPTE_BOOST_BOOST)
             {
                 //
                 // Double the amount of system PTEs