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Date: Tue, 25 Sep 2007 11:01:27 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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To: Darren Reed <darrenr@freebsd.org>
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Cc: freebsd-current@freebsd.org, Larry Rosenman <ler@lerctr.org>
Subject: Re: panic: kmem_malloc(131072): kmem_map too small (AMD64)
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Darren Reed wrote:
> Kris Kennaway wrote:
>> ...
>> Well yes, that is one hypothesis, but the evidence points elsewhere as 
>> well.  Prior the change you reference, some of my zfs machines would 
>> run for weeks before hitting a load pattern that exhausted their 
>> kmem_map and triggered the panic.  Also unless I have missed it I am 
>> not seeing the sudden flood of panic reports that may indicate sudden 
>> breakage.  It is quite possible that this particular report has 
>> nothing to do with the recent change.
> 
> Indeed.
> 
> But here's something else to ponder...
> 
> I've been using ZFS since it was internal beta at Sun, at first on i386 
> and later on amd64.
> I've never run into this kind of panic on Solaris.  System can get very 
> slow, yes, with
> ZFS hogging lots of memory, but it never panic'd because of it.
> 
> We need to come up with a strategy here to solve this problem, be it 
> fixing the kmem
> virtual memory or fixing zfs.

Yes, Solaris does something architecturally different because it is 
apparently acceptable for zfs to use gigabytes of memory by default.

Kris