Re: panic: UMA: Increase vm.boot_pages on Dell R920 r279210

On Mar 24, 2015, at 04:19, kwhite_at_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
_at__at_ -134,8 +134,9 _at__at_ 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,
_at__at_ -349,6 +350,7 _at__at_ 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,
_at__at_ -443,7 +445,7 _at__at_ vm_page_startup(vm_offset_t vaddr)


--
Rui Paulo