xnu-792.25.20.tar.gz

[apple/xnu.git] / bsd / dev / unix_startup.c

diff --git a/bsd/dev/unix_startup.c b/bsd/dev/unix_startup.c
index 33070c045669fbbaf89b47335d6261ae747c3fd7..018ea1583e65e13a03fb3b50f8b95230715eddfb 100644 (file)
--- a/bsd/dev/unix_startup.c
+++ b/bsd/dev/unix_startup.c
@@ -37,6 +37,8 @@
 #include <sys/mbuf.h>
 #include <sys/systm.h>
 #include <sys/tty.h>
+#include <sys/vnode.h>
+#include <sys/sysctl.h>
 #include <dev/ppc/cons.h>
 
 extern vm_map_t mb_map;
@@ -47,20 +49,28 @@ extern u_long   tcp_recvspace;
 void            bsd_bufferinit(void);
 extern void     md_prepare_for_shutdown(int, int, char *);
 
+int            bsd_mbuf_cluster_reserve(void);
+
 /*
  * Declare these as initialized data so we can patch them.
  */
 
 #ifdef NBUF
-int             nbuf = NBUF;
+int             max_nbuf_headers = NBUF;
 int             niobuf = NBUF / 2;
-
+int            nbuf_hashelements = NBUF;
+int            nbuf = NBUF;
 #else
-int             nbuf = 0;
+int             max_nbuf_headers = 0;
 int             niobuf = 0;
-
+int            nbuf_hashelements = 0;
+int            nbuf = 0;
 #endif
 
+SYSCTL_INT (_kern, OID_AUTO, nbuf, CTLFLAG_RD, &nbuf, 0, "");
+SYSCTL_INT (_kern, OID_AUTO, maxnbuf, CTLFLAG_RW, &max_nbuf_headers, 0, "");
+
+__private_extern__ int customnbuf = 0;
 int             srv = 0;       /* Flag indicates a server boot when set */
 int             ncl = 0;
 
@@ -77,21 +87,30 @@ bsd_startupearly(void)
        vm_size_t       size;
        kern_return_t   ret;
 
-       if (nbuf == 0)
-               nbuf = atop(sane_size / 100);   /* Get 1% of ram, but no more than we can map */
-       if (nbuf > 8192)
-               nbuf = 8192;
-       if (nbuf < 256)
-               nbuf = 256;
+       /* clip the number of buf headers upto 16k */
+       if (max_nbuf_headers == 0)
+               max_nbuf_headers = atop(sane_size / 50);        /* Get 2% of ram, but no more than we can map */
+       if ((customnbuf == 0) && (max_nbuf_headers > 16384))
+               max_nbuf_headers = 16384;
+       if (max_nbuf_headers < 256)
+               max_nbuf_headers = 256;
+
+       /* clip the number of hash elements  to 200000 */
+       if ( (customnbuf == 0 ) && nbuf_hashelements == 0) {
+               nbuf_hashelements = atop(sane_size / 50);
+               if (nbuf_hashelements > 200000)
+                       nbuf_hashelements = 200000;
+       } else
+               nbuf_hashelements = max_nbuf_headers;
 
        if (niobuf == 0)
-               niobuf = nbuf;
+               niobuf = max_nbuf_headers;
        if (niobuf > 4096)
                niobuf = 4096;
        if (niobuf < 128)
                niobuf = 128;
 
-       size = (nbuf + niobuf) * sizeof(struct buf);
+       size = (max_nbuf_headers + niobuf) * sizeof(struct buf);
        size = round_page(size);
 
        ret = kmem_suballoc(kernel_map,
@@ -116,13 +135,11 @@ bsd_startupearly(void)
        buf = (struct buf *) firstaddr;
        bzero(buf, size);
 
-       if (sane_size > (64 * 1024 * 1024) || ncl) {
+       {
                int             scale;
 
-               if ((nmbclusters = ncl) == 0) {
-                       if ((nmbclusters = ((sane_size / 16)/MCLBYTES)) > 32768)
-                               nmbclusters = 32768;
-               }
+               nmbclusters = bsd_mbuf_cluster_reserve() / MCLBYTES;
+
                if ((scale = nmbclusters / NMBCLUSTERS) > 1) {
                        tcp_sendspace *= scale;
                        tcp_recvspace *= scale;
@@ -133,6 +150,17 @@ bsd_startupearly(void)
                                tcp_recvspace = 32 * 1024;
                }
        }
+
+       /*
+        * Size vnodes based on memory 
+        * Number vnodes  is (memsize/64k) + 1024 
+        * This is the calculation that is used by launchd in tiger
+        * we are clipping the max based on 16G 
+        * ie ((16*1024*1024*1024)/(64 *1024)) + 1024 = 263168;
+        */
+       desiredvnodes  = (sane_size/65536) + 1024;
+       if (desiredvnodes > 263168)
+               desiredvnodes = 263168;
 }
 
 void
@@ -159,3 +187,24 @@ bsd_bufferinit(void)
         */
        bufinit();
 }
+
+/*
+ * this has been broken out into a separate routine that
+ * can be called from the x86 early vm initialization to
+ * determine how much lo memory to reserve on systems with
+ * DMA hardware that can't fully address all of the physical
+ * memory that is present.
+ */
+int
+bsd_mbuf_cluster_reserve(void)
+{
+       if (sane_size > (64 * 1024 * 1024) || ncl) {
+
+               if ((nmbclusters = ncl) == 0) {
+                       if ((nmbclusters = ((sane_size / 16)/MCLBYTES)) > 32768)
+                               nmbclusters = 32768;
+               }
+       }
+
+       return (nmbclusters * MCLBYTES);
+}