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 ca17cfe..e6a0024 100644 (file)
--- 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);