- Use an arbitrary but reasonably large import size for kva on architectures

   that don't support superpages.  This keeps the number of spans and internal
   fragmentation lower.
 - When the user asks for alignment from vmem_xalloc adjust the imported size
   by 2*align to be certain we can satisfy the allocation.  This comes at
   the expense of potential failures when the backend can't supply enough
   memory but could supply the requested size and alignment.

Sponsored by:	EMC / Isilon Storage Division

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/vm/vm_init.c b/sys/vm/vm_init.c
index 7ab1ee0..0a381d0 100644
--- a/sys/vm/vm_init.c
+++ b/sys/vm/vm_init.c
@@ -156,7 +156,8 @@ vm_mem_init(dummy)
 #if VM_NRESERVLEVEL > 0
 	    1 << (VM_LEVEL_0_ORDER + PAGE_SHIFT));
 #else
-	    PAGE_SIZE);
+	    /* On non-superpage architectures want large import sizes. */
+	    PAGE_SIZE * 1024);
 #endif
 
 	kmem_init_zero_region();