svn commit: r205384 - head/sys/conf

Alexander Motin mav at FreeBSD.org
Sat Mar 20 15:30:27 UTC 2010


Author: mav
Date: Sat Mar 20 15:30:26 2010
New Revision: 205384
URL: http://svn.freebsd.org/changeset/base/205384

Log:
  Correct MAXPHYS and DFLTPHYS description.

Modified:
  head/sys/conf/NOTES

Modified: head/sys/conf/NOTES
==============================================================================
--- head/sys/conf/NOTES	Sat Mar 20 15:28:39 2010	(r205383)
+++ head/sys/conf/NOTES	Sat Mar 20 15:30:26 2010	(r205384)
@@ -122,10 +122,10 @@ options 	BLKDEV_IOSIZE=8192
 #
 # MAXPHYS and DFLTPHYS
 #
-# These are the max and default 'raw' I/O block device access sizes.
-# Reads and writes will be split into DFLTPHYS chunks. Some applications
-# have better performance with larger raw I/O access sizes. Typically
-# MAXPHYS should be twice the size of DFLTPHYS. Note that certain VM
+# These are the maximal and safe 'raw' I/O block device access sizes.
+# Reads and writes will be split into MAXPHYS chunks for known good
+# devices and DFLTPHYS for the rest. Some applications have better
+# performance with larger raw I/O access sizes. Note that certain VM
 # parameters are derived from these values and making them too large
 # can make an an unbootable kernel.
 #


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