ZFS kmem_map too small.

Andrew Thompson thompsa at FreeBSD.org
Mon Nov 5 14:02:56 PST 2007


On Mon, Oct 08, 2007 at 02:15:23PM +0200, Pawel Jakub Dawidek wrote:
> Here are some updates:
> 
> I was able to reproduce the panic by rsyncing big files and trying
> bonnie++ test suggested in this thread.
> 
> Can you guys retry with this patch:
> 
> 	http://people.freebsd.org/~pjd/patches/vm_kern.c.2.patch
> 
> It's a hack, yes, but allows to mitigate the problem quite well. I'm
> looking for a solution that can be used for 7.0 before we find a better
> fix.

Do you still plan to commit this for 7.0 or is a better solution in the
works? I would assume something would need to be in before RC1.

> BTW. To use ZFS you _must_ increase vm.kmem_size/vm.kmem_size_max.
> If you have the problem discussed here and you're using standard values,
> please retry with vm.kmem_size/vm.kmem_size_max set to at least 600MB in
> /boot/loader.conf.
> 
> I'm not sure if it's not too late to ask re@ about increasing the
> default kmem size at least on amd64. ~300MB we have there is silly
> small.
> 
> -- 
> Pawel Jakub Dawidek                       http://www.wheel.pl
> pjd at FreeBSD.org                           http://www.FreeBSD.org
> FreeBSD committer                         Am I Evil? Yes, I Am!




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