process hang in zfs->io_ ?

[Gleb Kurtsou]

On (03/02/2009 22:15), Ganbold wrote:
> I've observed similar system hang when I tried to run svn update on
> FreeBSD head repo
> from 2 local directories simultaneously. I might be doing something
> wrong and as
> I remember I reproduced it a couple of times.
> 
> It is i386 CURRENT (r187663M) machine and loader.conf settings are:
> vm.kmem_size="1024M"
> vm.kmem_size_max="1024M"
> vfs.zfs.arc_max="100M"
I have no idea why, but vm.kmem_size{,_max}="1024M" slows things down a
lot. I'm running with 
vm.kmem_size="999M"
vm.kmem_size_max="999M"
and system seems to be much more responsive.