Date: Wed, 15 Jun 2005 14:11:09 -0400 From: Karim Fodil-Lemelin <kfl@xiphos.ca> To: "Goran Spirovski - MorEl On.net" <morel@on.net.mk>, freebsd-net@freebsd.org Subject: Re: (panic) Lots of network memory needed Message-ID: <42B06F3D.4050504@xiphos.ca> In-Reply-To: <002301c571d0$ab6c60b0$680a0a0a@onnet> References: <42B0528D.9080308@xiphos.ca> <002301c571d0$ab6c60b0$680a0a0a@onnet>
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Thanks but the system still crashes (FreeBSD 4.9) with 131072. Here is a
backtrace showing just that:
Debugger (msg=0xc02b6cdb "panic") at ../../i386/i386/db_interface.c:321
321 }
(kgdb) bt
#0 Debugger (msg=0xc02b6cdb "panic") at ../../i386/i386/db_interface.c:321
#1 0xc016a230 in panic (
fmt=0xc02ea380 "pmap_enter: invalid page directory pdir=%#llx,
va=%#x\n")
at ../../kern/kern_shutdown.c:593
#2 0xc0283594 in pmap_enter (pmap=0xc0340460, va=4292141056, m=0xc24b2848,
prot=7 '\a', wired=1) at ../../i386/i386/pmap.c:1943
#3 0xc023ddd0 in vm_fault (map=0xc033322c, vaddr=4292141056,
fault_type=7 '\a', fault_flags=1) at ../../vm/vm_fault.c:841
#4 0xc023df0a in vm_fault_wire (map=0xc033322c, start=4292141056,
end=4292149248) at ../../vm/vm_fault.c:915
#5 0xc0240831 in vm_map_pageable (map=0xc033322c, start=4292141056,
real_end=4292149248, new_pageable=0) at ../../vm/vm_map.c:1817
#6 0xc023ea25 in kmem_alloc (map=0xc033322c, size=8192)
at ../../vm/vm_kern.c:213
#7 0xc024a46f in _zget (z=0xdb5c6e80) at ../../vm/vm_zone.c:425
#8 0xc024a269 in zalloc (z=0xdb5c6e80) at ../../vm/vm_zone.c:60
#9 0xc0196106 in namei (ndp=0xfa489ef4) at ../../kern/vfs_lookup.c:104
#10 0xc01614ca in execve (p=0xfa482e00, uap=0xfa489f90)
at ../../kern/kern_exec.c:165
#11 0xc01590a1 in start_init (dummy=0x0) at ../../kern/init_main.c:543
(kgdb) p nmbclusters
$1 = 131072
(kgdb)
Goran Spirovski - MorEl On.net wrote:
>AFAIK the number of mbufs (and consequently nmbclusters) has to be a power
>of 2, so you should set it to 131072
>
>MorEl
>
>----- Original Message -----
>From: "Karim Fodil-Lemelin" <kfl@xiphos.ca>
>To: <freebsd-net@freebsd.org>
>Sent: Wednesday, June 15, 2005 6:08 PM
>Subject: (panic) Lots of network memory needed
>
>
>
>
>>Hello,
>>
>>From kernel tuning page
>>
>>
>(http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-kern
>el-limits.html)
>
>
>>Some sentence about nmbclusters says:
>>
>>"Under no circumstances should you specify an arbitrarily high value for
>>
>>
>this parameter as it could lead to a boot time crash."
>
>
>>Now I want to push the limits where I need 4KB buffer for each of the
>>
>>
>32000 connections I want this server to handle. If I do the math:
>
>
>>(32000 (conns) * 4 (KB/buffer) * 2 (buffer/conn)) / 2048 (KB/cluster)
>>
>>= 128000 clusters
>>
>>So I set this arbitrary high value in loader.conf under
>>
>>
>(kern.ipc.nmbclusters) and no surprises I get panic: pmap_enter invalid page
>directory pdir=0x3cb063, va=0xfff800
>
>
>>(va has a weird address here)
>>
>>I know I am pushing the limits here but I have plenty of memory (2GB) on
>>
>>
>this system (after all its just 250MB for network memory ;) and this is
>mainly just experimentation.
>
>
>>I would like some pointers toward fixing this. Is there another variable
>>
>>
>tied into this (I guess so)? Could anybody points me to a technical document
>that would explain the relationship with that (those) other(s) presumed
>variable(s)?
>
>
>>Thank you,
>>
>>
>>Karim
>>
>>
>>_______________________________________________
>>freebsd-net@freebsd.org mailing list
>>http://lists.freebsd.org/mailman/listinfo/freebsd-net
>>To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
>>
>>
>
>
>
>
>
--
Karim Fodil-Lemelin
Lead Programmer
Xiphos Technologies Inc.
(514) 848-9640 x223
(514) 848-9644 fax
www.xiplink.com
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