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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 4 Sep 2010 17:27:48 +0000 (UTC)
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Subject: svn commit: r212212 - user/nwhitehorn/ps3/powerpc/powerpc
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Author: nwhitehorn
Date: Sat Sep  4 17:27:48 2010
New Revision: 212212
URL: http://svn.freebsd.org/changeset/base/212212

Log:
  It does not make sense to allocate 30MB of physical memory for bounce
  pages on low energy machines. On a PS3, 15% of the available physical
  memory was going into bounce page reservations. Instead, cap the number
  at 2.5% of physical memory or 30MB, whichever is smaller.

Modified:
  user/nwhitehorn/ps3/powerpc/powerpc/busdma_machdep.c

Modified: user/nwhitehorn/ps3/powerpc/powerpc/busdma_machdep.c
==============================================================================
--- user/nwhitehorn/ps3/powerpc/powerpc/busdma_machdep.c	Sat Sep  4 17:04:34 2010	(r212211)
+++ user/nwhitehorn/ps3/powerpc/powerpc/busdma_machdep.c	Sat Sep  4 17:27:48 2010	(r212212)
@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <machine/bus.h>
 #include <machine/md_var.h>
 
-#define MAX_BPAGES 8192
+#define MAX_BPAGES MIN(8192, physmem/40)
 
 struct bounce_zone;