On Mon, Mar 10, 2008 at 09:24:55PM -0700, Kip Macy wrote: > 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. On the usual modern i386 hardware with usual load we easily handle ~30000 threads, with the top coming at around 50000 threads. The most limiting factor, from my POV, is the kernel address space, since each thread takes 3 pages for the kernel stack.
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