xnu-1504.9.37.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 9822fbd884096e0fa129d0d782a46eea1f039e21..4ec548794d791ef4b6c2b818e370d82b4e811a8e 100644 (file)
--- a/bsd/dev/unix_startup.c
+++ b/bsd/dev/unix_startup.c
@@ -61,7 +61,7 @@ extern uint32_t   tcp_recvspace;
 void            bsd_bufferinit(void) __attribute__((section("__TEXT, initcode")));
 extern void     md_prepare_for_shutdown(int, int, char *);
 
-unsigned int   bsd_mbuf_cluster_reserve(void);
+unsigned int   bsd_mbuf_cluster_reserve(boolean_t *);
 void bsd_srv_setup(int);
 void bsd_exec_setup(int);
 
@@ -159,7 +159,7 @@ bsd_startupearly(void)
 #endif
                int             scale;
 
-               nmbclusters = bsd_mbuf_cluster_reserve() / MCLBYTES;
+               nmbclusters = bsd_mbuf_cluster_reserve(NULL) / MCLBYTES;
 
 #if INET || INET6
                if ((scale = nmbclusters / NMBCLUSTERS) > 1) {
@@ -237,9 +237,10 @@ bsd_bufferinit(void)
  * memory that is present.
  */
 unsigned int
-bsd_mbuf_cluster_reserve(void)
+bsd_mbuf_cluster_reserve(boolean_t *overridden)
 {
        int mbuf_pool = 0;
+       static boolean_t was_overridden = FALSE;
 
        /* If called more than once, return the previously calculated size */
        if (mbuf_poolsz != 0)
@@ -263,6 +264,10 @@ bsd_mbuf_cluster_reserve(void)
                ncl = (mbuf_pool << MBSHIFT) >> MCLSHIFT;
 
         if (sane_size > (64 * 1024 * 1024) || ncl != 0) {
+
+               if (ncl || srv)
+                       was_overridden = TRUE;
+
                if ((nmbclusters = ncl) == 0) {
                        /* Auto-configure the mbuf pool size */
                        nmbclusters = mbuf_default_ncl(srv, sane_size);
@@ -278,6 +283,9 @@ bsd_mbuf_cluster_reserve(void)
        }
        mbuf_poolsz = nmbclusters << MCLSHIFT;
 done:
+       if (overridden)
+               *overridden = was_overridden;
+
        return (mbuf_poolsz);
 }
 #if defined(__LP64__)