clamp kvm useage

diff --git a/sys/arch/sparc/sparc/machdep.c b/sys/arch/sparc/sparc/machdep.c
index 03dc4fc..e2b1955 100644 (file)
--- a/sys/arch/sparc/sparc/machdep.c
+++ b/sys/arch/sparc/sparc/machdep.c
@@ -324,18 +324,30 @@ allocsys(v)
        valloc(msqids, struct msqid_ds, msginfo.msgmni);
 #endif
 
+#ifndef BUFCACHEPERCENT
+#define BUFCACHEPERCENT 5
+#endif
        /*
         * Determine how many buffers to allocate (enough to
         * hold 5% of total physical memory, but at least 16).
         * Allocate 1/2 as many swap buffer headers as file i/o buffers.
         */
        if (bufpages == 0)
-               bufpages = (physmem / 20) / CLSIZE;
+               bufpages = (physmem / ((100/BUFCACHEPERCENT) / CLSIZE));
+       /* Restrict to at most 70% filled kvm */
+       if (bufpages * MAXBSIZE >
+           (VM_MAX_KERNEL_ADDRESS-VM_MIN_KERNEL_ADDRESS) * 7 / 10)
+               bufpages = (VM_MAX_KERNEL_ADDRESS-VM_MIN_KERNEL_ADDRESS) /
+                   MAXBSIZE * 7 / 10;
        if (nbuf == 0) {
                nbuf = bufpages;
                if (nbuf < 16)
                        nbuf = 16;
        }
+#if defined(SUN4C) || defined(SUN4)
+       if ((CPU_ISSUN4C || CPU_ISSUN4) && nbuf > 200)
+               nbuf = 200;
+#endif
        if (nswbuf == 0) {
                nswbuf = (nbuf / 2) &~ 1;       /* force even */
                if (nswbuf > 256)