On Jun 15, 2006, at 10:33 AM, David Brownlee wrote:

> 	One of our boxes has started to do this every few nights.
>
> 	Wondered if anyone had any thoughts as to what could be adjusted:

Well, you're either running out of KVA or memory.  Dump the contents  
of uvmexp to see if its memory.

>
> 	Machine is an 2GB ASUS A8V-Deluxe running NetBSD/i386 3.0
> 	from 14/6/06, with a single 74GB WD raptor (its a test
> 	machine hence why its not running raidframe).
>
> 	It runs a (single) quite large apache-tomcat-5.5.14nb1 app
> 	under sun-jdk15-5.0.7 (suse_base-10.0nb1), with around 150
> 	webapps, and postgresql81-8.1.4 with (for some obvious
> 	reason) around 150 databases.
>
> 	I'm currently testing the native NetBSD jdk (scsl-jdk15 -
> 	many thanks to tv), but as the panic occurs every few nights
> 	(quite possibly during the database backups), I won't know
> 	if that helps for a while.
>
> 	panic is:
>
>    panic: pmap_enter: no pv entries available
>     Begin traceback...
>     pmap_enter(a07a5920,be0a7000,4d129000,3,1) at netbsd:pmap_enter 
> +0x3bc
>     ubc_fault(x2f67c20,be0a7000,c2f67ba0,1,0) at netbsd:ubc_fault 
> +0x20f
>     uvm_fault(a0790aa0,be0a7000,0,1,c2f67e64) at netbsd:uvm_fault 
> +0xdf6
>     trap() at netbsd:trap+0x35f
>     --- trap (number 6) ---
>     i486_copyout()
>     ffs_read()
>     VOP_READ()
>     vn_read()
>     dofileread()
>     sys_read()
>     linux_syscall_plain()
>
> 	The more interesting kernel options set are:
>
> options 	HZ=1024			#@ ogle
> options 	SHMMAXPGS=65536		#@ Postgres/ogle
> options         SEMMNI=256		#@ Postgres
> options         SEMMNS=1024		#@ Postgres
> options         SEMMNU=256		#@ Postgres
> options         SEMMAP=256		#@ Postgres
>
> options 	NPROC=4096
> options 	MAXUPRC=1024
> options 	NOFILE=512
> options 	NMBCLUSTERS=8192
> options 	NVNODE=131072		#  128K
> options 	DFLDSIZ=536870912	#  512M
> options 	MAXDSIZ=2146435072	# 2047M
>
> options 	NKMEMPAGES_MAX=98304	# Normally 32K, 128K fails to boot
>
> # Have kernel take upper 1.5GB of VM to avoid potential issues with  
> 4GB
>
> options KERNBASE_LOCORE=0xa0000000
> makeoptions TEXTADDR=0xa0100000
>
> 	full kernel config & kernel at http://www.mono.org/abs/no-pv/
>
> -- 
> 			   David Brownlee -- abs@absd.org

-- thorpej