Mike Tancsa wrote:
At 09:20 AM 12/2/2008, Kostik Belousov wrote:
On Tue, Dec 02, 2008 at 09:12:54AM -0500, Mike Tancsa wrote:
> At 08:38 AM 12/2/2008, Kostik Belousov wrote:
> >>
> >> mdconfig -a -t malloc -s 1800M
> >You cannot have ~ 2Gb of kernel memory allocated for md, at least
not on
> >i386.
>
> Thanks, how do I find out what the limit is on a machine ? Is it
> vm.kvm_size ?
It is much less, and highly depends on your load, since KVA is used
for all
kind of allocations made by kernel. I think either md(4) or
mdconfig(8) have
a warning about malloc backing for md.
Thanks! A warning might be helpful to prevent such foot shooting :)
malloc Storage for this type of memory disk is allocated
with
malloc(9). This limits the size to the malloc bucket
limit in the kernel. If the -o reserve option is not
set, creating and filling a large malloc-backed
memory
disk is a very easy way to panic a system.
You almost never want to use malloc backing for a md, in favour of swap
backing.
Kris
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