panic: kmem_malloc; Should I increase some setting?

Robert Watson rwatson at
Tue Jun 29 18:33:25 PDT 2004

On Tue, 29 Jun 2004, Doug White wrote:

> On Wed, 30 Jun 2004, Ronald Klop wrote:
> > I get the following panics while untarring a 30MB archive on an md device
> > create with:
> > tmpmfs="YES"
> > tmpsize="256m"
> This is a malloc-backed md disk, which consumes memory directly from
> KVM.  If you do a large extraction it will consume all of KVM and cause
> your panic.  Unless you're running diskless and this is your only option
> besides NFS, either don't use tmpmfs or avoid extracting large amounts
> of data to /tmp. 

What you want to do is use a swap-backed /tmp, assuming there's local
swap.  We should probably discuss why the rc.conf bits use malloc-backed
by default in what sounds like a non-diskless environment?

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at      Principal Research Scientist, McAfee Research

> > panic: kmem_malloc(16384): kmem_map too small: 86233088 total allocated
> -- 
> Doug White                    |  FreeBSD: The Power to Serve
> dwhite at          |
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