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Date: Wed, 15 Dec 2010 23:55:40 +0100
From: Jeremie Le Hen <jeremie@le-hen.org>
To: Andriy Gapon <avg@freebsd.org>
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Cc: freebsd-stable@freebsd.org, Jeremie Le Hen <jeremie@le-hen.org>
Subject: Re: Panic in ZFS layer on 8.1-STABLE
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On Wed, Dec 15, 2010 at 07:28:57PM +0200, Andriy Gapon wrote:
> on 15/12/2010 10:28 Jeremie Le Hen said the following:
> > Hi,
> > 
> > [ Please Cc: me when replying, as I'm not subscribed to -stable@. ]
> > 
> > My filer at home runs FreeBSD.  A single data RAID-1 zpool with 10~15
> > datasets, two of them using compression.  Over the night, I got the
> > following panic:
> 
> Thanks for the stack trace!
> But where is the promised panic message? :)

Eheh, sorry for this :-).

> I suspect that you ran out of kernel address space.
> You'd probably have to tune your system and/or add more memory.
> Please research this topic via mailing lists archives.

You guessed right!

  panic: kmem_malloc(114688): kmem_map too small: 775847936 total allocated

I think running a 64 bits kernel would help a lot in that case.
Unfortunately I don't think my CPU supports the instruction set:

CPU: Intel(R) Core(TM)2 CPU          6320  @ 1.86GHz (1869.88-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x6f6  Family = 6  Model = f  Stepping = 6
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
  AMD Features=0x20000000<LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant


I will look into the wiki about ZFS tuning.
Thanks,
-- 
Jeremie Le Hen

Humans are born free and equal.  But some are more equal than others.
					    Coluche