From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Sun, 26 Aug 2012 17:09:19 +0000 (-0700)
Subject: kernel - reduce kern.maxvnodes default on 32 bit systems
X-Git-Tag: v3.2.0~250
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/61c0750556b971f960a6783bf22f9f7c22bd856a?ds=sidebyside

kernel - reduce kern.maxvnodes default on 32 bit systems

* Reduce maximum kern.maxvnodes on standard-configured 32 bit systems
  from ~100K vnodes to ~80K vnodes to reduce kmem usage.
---

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index ca17cfe1e8..e6a0024746 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -179,7 +179,7 @@ vfs_subr_init(void)
 	 * Desiredvnodes is kern.maxvnodes.  We want to scale it 
 	 * according to available system memory but we may also have
 	 * to limit it based on available KVM, which is capped on 32 bit
-	 * systems.
+	 * systems, to ~80K vnodes or so.
 	 *
 	 * WARNING!  For machines with 64-256M of ram we have to be sure
 	 *	     that the default limit scales down well due to HAMMER
@@ -187,7 +187,7 @@ vfs_subr_init(void)
 	 *	     We want around ~5800 on a 128M machine.
 	 */
 	factor1 = 20 * (sizeof(struct vm_object) + sizeof(struct vnode));
-	factor2 = 22 * (sizeof(struct vm_object) + sizeof(struct vnode));
+	factor2 = 25 * (sizeof(struct vm_object) + sizeof(struct vnode));
 	desiredvnodes =
 		imin((int64_t)vmstats.v_page_count * PAGE_SIZE / factor1,
 		     KvaSize / factor2);