vm_thread_new: kstack allocation failed with many ZFS FS and NFSD

Kip Macy kip.macy at gmail.com
Mon Mar 10 21:24:57 PDT 2008

On Mon, Mar 10, 2008 at 6:13 PM, Zaphod Beeblebrox <zbeeble at gmail.com> wrote:
> On Mon, Mar 10, 2008 at 8:30 PM, Kris Kennaway <kris at freebsd.org> wrote:
>  > Your kernel has run out of memory.  If you cannot tune kmem_size further
>  > then it cannot handle this many ZFS filesystems.
>  Roughly how much kernel memory does a filesystem use (even if inactive) ---
>  or did you really mean something like too many pools?
>  The ZFS documentation encourages creating filesystems for everything.  I
>  think my (rather beafy) laptop has 20 filesystems now for various tasks ---
>  but I didn't realize there was a non-trivial cost (that is: a cost beyond
>  the mount structure, root vnodes and whatnot)...

There may be kernel threads created for each file system. One way to
look at it is that a process isn't that expensive, but FreeBSD
probably couldn't cope very well with 5000 processes.


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