svn commit: r210410 - head/sys/kern

[Ivan Voras]

Author: ivoras
Date: Fri Jul 23 12:30:29 2010
New Revision: 210410
URL: http://svn.freebsd.org/changeset/base/210410

Log:
  Make lorunningspace catch up with hirunningspace.
  While there, add comment about the magic numbers.
  
  Prodded by:	alc

Modified:
  head/sys/kern/vfs_bio.c

Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c	Fri Jul 23 11:00:46 2010	(r210409)
+++ head/sys/kern/vfs_bio.c	Fri Jul 23 12:30:29 2010	(r210410)
@@ -620,9 +620,14 @@ bufinit(void)
 	hibufspace = lmax(3 * maxbufspace / 4, maxbufspace - MAXBSIZE * 10);
 	lobufspace = hibufspace - MAXBSIZE;
 
-	lorunningspace = 512 * 1024;
+	/*
+	 * Note: The 16 MB upper limit for hirunningspace was chosen
+	 * arbitrarily and may need further tuning. The lower 1 MB
+	 * limit is the historical upper limit for hirunningspace.
+	 */
 	hirunningspace = lmax(lmin(roundup(hibufspace / 64, MAXBSIZE),
 	    16 * 1024 * 1024), 1024 * 1024);
+	lorunningspace = roundup(hirunningspace / 2, MAXBSIZE);
 
 /*
  * Limit the amount of malloc memory since it is wired permanently into