diff -Nur xen/arch/x86/x86_32/mm.c new-xen/arch/x86/x86_32/mm.c
--- xen/arch/x86/x86_32/mm.c	2006-05-18 03:07:55.000000000 -0400
+++ new-xen/arch/x86/x86_32/mm.c	2006-05-18 03:06:12.000000000 -0400
@@ -62,6 +62,8 @@
     return &idle_pg_table_l2[l2_linear_offset(v)];
 }
 
+extern unsigned long lowmem_emergency_pool_pages;
+
 void __init paging_init(void)
 {
     void *ioremap_pt;
@@ -126,6 +128,18 @@
             l2e_from_page(virt_to_page(idle_vcpu[0]->domain->
                                        arch.mm_perdomain_pt) + i,
                           __PAGE_HYPERVISOR);
+    
+    /* 
+     * Size the lowmem_emergency_pool based on the total memory on the box 
+     * This pool is needed only on 32 bit PAE configurations (4g to 16g).
+     */ 
+    if (lowmem_emergency_pool_pages) 
+    	return;
+    if ((total_pages > (1000 * 1000) && (total_pages <= (2000*1000)))) {
+    	lowmem_emergency_pool_pages = 4000;
+    } else if ((total_pages > (2000 * 1000) && (total_pages < (4*1000*1000)))) {
+    	lowmem_emergency_pool_pages = 8000;
+    }
 }
 
 void __init zap_low_mappings(l2_pgentry_t *base)
diff -Nur xen/common/page_alloc.c new-xen/common/page_alloc.c
--- xen/common/page_alloc.c	2006-05-18 03:07:20.000000000 -0400
+++ new-xen/common/page_alloc.c	2006-05-18 03:03:45.000000000 -0400
@@ -47,7 +47,7 @@
  * allocation requests. Ordinary requests will not fall back to the
  * lowmem emergency pool.
  */
-static unsigned long lowmem_emergency_pool_pages;
+unsigned long lowmem_emergency_pool_pages;
 static void parse_lowmem_emergency_pool(char *s)
 {
     unsigned long long bytes;