Date: Tue, 17 Mar 2009 14:37:26 +0000 From: Bob Bishop <rb@gid.co.uk> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: A trio of problems Message-ID: <E3DDF962-1B10-49A1-8B4A-B6F1F0466E61@gid.co.uk> In-Reply-To: <gpoacd$boc$1@ger.gmane.org> References: <gpmnba$3na$1@ger.gmane.org> <D9950E0E-453C-464F-8C94-E5073AA99EE7@gid.co.uk> <gpoacd$boc$1@ger.gmane.org>
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On 17 Mar 2009, at 13:59, Ivan Voras wrote: > 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), Dunno > 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. I'd suggest increasing kernel mem but I don't know if/how that's tunable on amd64. -- Bob Bishop rb@gid.co.uk
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