On Tue, 24 Mar 2015, Rui Paulo wrote:

On Mar 24, 2015, at 04:19, kwh...@site.uottawa.ca wrote:


I'm using /boot/loader.conf. Is there another place I should be doing this?

No, that's correct, but apparently there's a problem: the RDTUN sysctl is not 
picked up early enough.  Can you try this patch?  I haven't really tested it. 
:-)

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 79665ba..a764788 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -134,8 +134,9 @@ long first_page;
int vm_page_zero_count;

static int boot_pages = UMA_BOOT_PAGES;
-SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RDTUN, &boot_pages, 0,
-       "number of pages allocated for bootstrapping the VM system");
+SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
+    &boot_pages, 0,
+    "number of pages allocated for bootstrapping the VM system");

static int pa_tryrelock_restart;
SYSCTL_INT(_vm, OID_AUTO, tryrelock_restart, CTLFLAG_RD,
@@ -349,6 +350,7 @@ vm_page_startup(vm_offset_t vaddr)
        * Allocate memory for use when boot strapping the kernel memory
        * allocator.
        */
+       TUNABLE_INT_FETCH("vm.boot_pages", &boot_pages);
       new_end = end - (boot_pages * UMA_SLAB_SIZE);
       new_end = trunc_page(new_end);
       mapped = pmap_map(&vaddr, new_end, end,
@@ -443,7 +445,7 @@ vm_page_startup(vm_offset_t vaddr)


--
Rui Paulo

Patch tried.  Success!

I now get this after setting vm.boot_pages=1024 in /boot/loader.conf:

Booting...
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2015 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 11.0-CURRENT #1: Tue Mar 24 13:44:48 UTC 2015
    root@:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.5.1 (tags/RELEASE_351/final 225668) 20150115
WARNING: WITNESS option enabled, expect reduced performance.
UMA startup boot_pages: 1024
...

And can start all 120 processors.

Thanks!

...keith
--
Keith White, genie.uottawa.ca engineering.uottawa.ca
kwh...@uottawa.ca [+1 613 562 5800 x6681]
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