Re: kmem change related trouble

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Fri, 3 Feb 2012, Lars Heidieker wrote:

> The code for proper kmem_arena sizing:
> http://www.netbsd.org/~para/kmemsizing.diff
> 
> params done for i386/amd64/sparc64/arm32

Explain this to me:

 /*
- * Minimum and maximum sizes of the kernel malloc arena in 
PAGE_SIZE-sized
+ * Minimum size of the kernel kmem_arena in PAGE_SIZE-sized
  * logical pages.
+ * No enforced maximum on sparc64.
  */
-#define        NKMEMPAGES_MIN_DEFAULT  ((6 * 1024 * 1024) >> PAGE_SHIFT)
-#define        NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> 
PAGE_SHIFT)
+#define        NKMEMPAGES_MIN_DEFAULT  ((64 * 1024 * 1024) >> PAGE_SHIFT)
+#define        NKMEMPAGES_MAX_UNLIMITED 1
 

Does this mean a machine needs to allocate a minimum of 64MB for the 
kernel kmem_arena or it won't boot?  What happens if a machine only has 
64MB of DRAM?

Eduardo