Protect MAXPHYS against redefinition- this allows you to make a config

option for increasing it to something reasonable for large I/O subsystems
(you get 22MB/s on some of the DataDirect RAID arrays at 64K, about 37MB/s
when you get go to 256KB transfers).

diff --git a/sys/arch/i386/include/param.h b/sys/arch/i386/include/param.h
index ed1128d..6d32250 100644 (file)
--- a/sys/arch/i386/include/param.h
+++ b/sys/arch/i386/include/param.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: param.h,v 1.10 2000/02/22 19:27:48 deraadt Exp $      */
+/*     $OpenBSD: param.h,v 1.11 2000/04/07 21:05:05 mjacob Exp $       */
 /*     $NetBSD: param.h,v 1.29 1996/03/04 05:04:26 cgd Exp $   */
 
 /*-
@@ -82,7 +82,9 @@
 #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
 #define        DEV_BSIZE       (1 << DEV_BSHIFT)
 #define        BLKDEV_IOSIZE   2048
+#ifndef        MAXPHYS
 #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
+#endif
 
 #define        CLSIZELOG2      0
 #define        CLSIZE          (1 << CLSIZELOG2)