Changeset 36944 in vbox

Timestamp:

May 3, 2011 5:13:31 PM (14 years ago)

Author:

vboxsync

Message:

VBox/param.h: Bumped the max RAM limit up to 2TB on 64-bit hosts (was 16GB). Docs

Location:

trunk

Files:

• include/VBox/param.h (modified) (2 diffs)
• src/VBox/VMM/VMMR0/GMMR0.cpp (modified) (1 diff)
• src/VBox/VMM/VMMR3/VMM.cpp (modified) (1 diff)

trunk/include/VBox/param.h

@@ -72 +72 @@
 /** The maximum guest RAM size in bytes. */
 #if HC_ARCH_BITS == 64
-# define MM_RAM_MAX                 UINT64_C(0x400000000)
+# define MM_RAM_MAX                 UINT64_C(0x20000000000)
 #else
-# define MM_RAM_MAX                 UINT64_C(0x0E0000000)
+# define MM_RAM_MAX                 UINT64_C(0x000E0000000)
 #endif
 /** The minimum guest RAM size in MBs. */
@@ -80 +80 @@
 /** The maximum guest RAM size in MBs. */
 #if HC_ARCH_BITS == 64
-# define MM_RAM_MAX_IN_MB           UINT32_C(16384)
+# define MM_RAM_MAX_IN_MB           UINT32_C(2097152)
 #else
 # define MM_RAM_MAX_IN_MB           UINT32_C(3584)

trunk/src/VBox/VMM/VMMR0/GMMR0.cpp

@@ -134 +134 @@
  *
  *
- * @section sec_gmm_numa  NUMA
+ * @section sec_gmm_numa        NUMA
  *
  * NUMA considerations will be designed and implemented a bit later.

trunk/src/VBox/VMM/VMMR3/VMM.cpp

@@ -44 +44 @@
  *
  * To be written.
+ *
+ *
+ * @sections sec_vmm_limits     VMM Limits
+ *
+ * There are various resource limits imposed by the VMM and it's
+ * sub-components.  We'll list some of them here.
+ *
+ * On 64-bit hosts:
+ *      - Max 1023 VMs.  Imposed by GVMM's handle allocation
+ *        (GVMM_MAX_HANDLES), can be increased up to 64K.
+ *      - Max 16TB - 64KB of the host memory can be used for backing VM RAM and
+ *        ROM pages.  The limit is imposed by the 32-bit page ID used by GMM.
+ *      - A VM can be assigned all the memory we can use (16TB), however, the
+ *        Main API will restrict this to 2TB (MM_RAM_MAX_IN_MB).
+ *      - Max 32 virtual CPUs (VMM_MAX_CPU_COUNT).
+ *
+ * On 32-bit hosts:
+ *      - Max 127 VMs.  Imposed by GMM's per page structure.
+ *      - Max 64GB - 64KB of the host memory can be used for backing VM RAM and
+ *        ROM pages.  The limit is imposed by the 28-bit page ID used
+ *        internally in GMM.  It is also limited by PAE.
+ *      - A VM can be assigned all the memory GMM can allocate, however, the
+ *        Main API will restrict this to 3584MB (MM_RAM_MAX_IN_MB).
+ *      - Max 32 virtual CPUs (VMM_MAX_CPU_COUNT).
  *
  */