A trio of problems

Ivan Voras ivoras at freebsd.org
Tue Mar 17 06:59:53 PDT 2009

Bob Bishop wrote:
> Hi,
> On 16 Mar 2009, at 23:28, Ivan Voras wrote:
>> 1. I'm trying to start 1000 jails for demonstration purposes (a
>> presentation), but I can reliably panic the kernel when somewhere
>> between 400 and 600 jails are started. [etc]
> On 17 Mar 2009, at 01:37, Ivan Voras wrote:
>> ZFS doesn't influence it - the same problem happens without ZFS on the
>> system (though I can create a few hundred more jails without ZFS before
>> the kernel panics...).
> In which case, given how memory-hungry ZFS is, it looks like your
> problem is with exhausting some memory resource.

It did occur to me but if it is, why didn't it fail in an obvious way
(e.g. kmem_map panics with ZFS), and how to tune it so if works? This is
AMD64 with 0.5 GB - 1 GB memory in the Free bin when it panics.

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