Date: Fri, 22 Jan 1999 10:20:40 +0000 From: Geoff Buckingham <geoffb@demon.net> To: Mike Smith <mike@smith.net.au> Cc: freebsd-current@FreeBSD.ORG Subject: Re: KVA/KVM shortages Message-ID: <19990122102040.H19395@gti.noc.demon.net> In-Reply-To: <199901212153.NAA11404@dingo.cdrom.com>; from Mike Smith on Thu, Jan 21, 1999 at 01:53:44PM -0800 References: <19990121180941.G19395@gti.noc.demon.net> <199901212153.NAA11404@dingo.cdrom.com>
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Previously on Thu, Jan 21, 1999 at 01:53:44PM -0800, Mike Smith wrote:
: > On tuesday I crashed a machine after it ran out of kvm. (dual PII 400 with
: > 768MB RAM) poking about in the code adding:
: >
: > options "VM_KMEM_SIZE=(24*1024*1024)"
: > options "VM_KMEM_SIZE_MAX=(128*1024*1024)"
: >
: > seems like a good way foward. Is it?
:
: >From what I can see, you shouldn't need to set VM_KMEM_SIZE_MAX unless
: you're also setting VM_KMEM_SIZE_SCALE.
:
My understanding was VM_KMEM_SIZE_SCALE picks up a default of value of 3
from vmparam.h, which if I understand the following from kern-malloc.c
vm_kmem_size = VM_KMEM_SIZE;
mem_size = cnt.v_page_count * PAGE_SIZE;
#if defined(VM_KMEM_SIZE_SCALE)
if ((mem_size / VM_KMEM_SIZE_SCALE) > vm_kmem_size)
vm_kmem_size = mem_size / VM_KMEM_SIZE_SCALE;
#endif
#if defined(VM_KMEM_SIZE_MAX)
if (vm_kmem_size >= VM_KMEM_SIZE_MAX)
vm_kmem_size = VM_KMEM_SIZE_MAX;
#endif
combined with the apparent defaults of
VM_KMEM_SIZE 12M
VM_KMEM_SIZE_SCALE 3
VM_KMEM_SIZE_MAX 80M
means vm_kmem_size never gets bigger than 80M without VM_KMEM_SIZE_MAX being
defined >80M
(This is all from a mid december 3.x box)
: I just committed a tweak that allows you to say:
:
: set kern.vm.kmem.size=<value>
:
: at the loader prompt or in /boot/loader.rc to override the default
: VM_KMEM_SIZE value.
:
Unless I am being too literal or miss-understanding the above do you not need
to set VM_KMEM_SIZE_MAX or have thing moved on since december?
--
GeoffB
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