Re: 5.2-RELEASE crash
From: Andre Guibert de Bruet (andy_at_siliconlandmark.com)
Date: 01/31/04
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Date: Sat, 31 Jan 2004 01:12:16 -0500 (EST) To: Magnus Dahlstedt <n97magda@midgard.liu.se>
On Fri, 30 Jan 2004, Magnus Dahlstedt wrote:
> panic: kmem_malloc(16384): kmem_map too small: 275243008 total allocated
> cpuid = 1;
> Debugger("panic")
> Stopped at Debugger+0x4f: xchgl %ebx,in_Debugger.0
> db> trace
> Debugger(c06c2ccd,1,c06d5a05,e40a6a74,100) at Debugger+0x4f
> panic(c06d5a05,4000,1067e000,e40a6aa0,c0518254) at panic+0x14a
> kmem_malloc(c10310a0,4000,402,e40a6aec,c064c19e) at kmem_malloc+0x101
-- 8< -- snip -- 8< --
> real memory = 2146942976 (2047 MB)
> avail memory = 2080309248 (1983 MB)
You are using a large amount of RAM and using the default kmem_map sizing
options. What you want to do to fix this is manually increase the
KVA_PAGES tunable to something like 640 (By putting "options
KVA_PAGES=640" in your kernel config file).
You will also want to grow your kmem_map by changing the following:
options VM_KMEM_SIZE_MAX=(512*1048576)
options VM_KMEM_SIZE_SCALE=2
On a busy system with 3.5GB, I found that using 768MB for VM_KMEM_SIZE_MAX
helps it run flawlessly. These values are not set in stone, and should
only be used as a guide. In other words, do your own testing! :-)
There are a number of really interesting posts that have been made on
this issue, the most notable ones being from David Schultz and Terry
Lambert. You can find them online at
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2003-06/1599.html
Regards,
> Andre Guibert de Bruet | Enterprise Software Consultant >
> Silicon Landmark, LLC. | http://siliconlandmark.com/ >
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