From a59d364a23cc9c69b00c3111d78cfaa7abce00d3 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@FreeBSD.org>
Date: Wed, 22 Sep 1999 04:11:55 +0000
Subject:     Change default block size for user VBLK device access from 2K to
 PAGE_SIZE     (4K on an i386, 8K on an alpha).

    Make BLKDEV_IOSIZE, DFLTPHYS, and MAXPHYS kernel-configurable.
---
 sys/alpha/include/param.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'sys/alpha')

diff --git a/sys/alpha/include/param.h b/sys/alpha/include/param.h
index 873ea8504b4f..2bb660ca4cb7 100644
--- a/sys/alpha/include/param.h
+++ b/sys/alpha/include/param.h
@@ -98,9 +98,16 @@
 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
 #define	DEV_BSIZE	(1<<DEV_BSHIFT)
 
-#define BLKDEV_IOSIZE	2048
+#ifndef BLKDEV_IOSIZE
+#define BLKDEV_IOSIZE  PAGE_SIZE	/* default block device I/O size */
+#endif
+
+#ifndef DFLTPHYS
 #define DFLTPHYS	(64 * 1024)	/* default max raw I/O transfer size */
+#endif
+#ifndef MAXPHYS
 #define MAXPHYS		(128 * 1024)	/* max raw I/O transfer size */
+#endif
 
 #define	CLSIZE		1
 #define	CLSIZELOG2	0
-- 
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