Re: pmap vs. large Zorro III space

[mlelstv%serpens.de@localhost (Michael van Elst)]

frank%phoenix.owl.de@localhost (Frank Wille) writes:

>On Fri, 22 Jul 2011 20:09:17 +0200
>Rados?aw Kujawa <radoslaw.kujawa%c0ff33.net@localhost> wrote:

>> Yesterday I've installed Matay Prometheus PCI, which allocates very large
>> Zorro III space (512MB). 
>> 
>> As soon as kernel was loaded, panic occured with  "uvm_km_suballoc:
>> unable to allocate space in parent map" error.
>> [...]
>> probaby related to page tables map allocation and that I might want to
>> increase VM_KERNEL_PT_PAGES (defined in vmparam.h).

>Yes. I doubt that there is enough space for page tables to map the whole
>512MB area.


NetBSD 5.99.51 (DUMMY) #0: Sun May  1 13:43:56 CEST 2011
        
mlelstv@henery:/home/netbsd-current/obj.amiga/home/netbsd-current/src/sys/arch/amiga/compile/DUMMY
total memory = 2048 MB
avail memory = 2021 MB
memory segment 0 at 40000000 size 80000000
memory segment 1 at 00000000 size 00200000

Why does it not panic here?

# pmap 0
00000000  24824K read/write/exec     [ stack ]
0183E000      8K read/write/exec     [ stack ]
01840000   6616K read/write/exec     [ stack ]
01EB6000   1184K read/write/exec     [ stack ]
01FDE000     64K read/write/exec     [ stack ]
01FEE000 132520K read/write/exec     [ kmem_map ]
0A158000  16384K read/write/exec     [ pager_map ]
0B158000    416K read/write/exec     [ anon ]
0B1C0000  16384K read/write/exec     [ phys_map ]
0C1C0000   4856K read/write/exec     [ anon ]
0C67E000   8192K read/write/exec     [ ubc_pager ]
0CE7E000    360K read/write/exec     [ anon ]
0CED8000     16K read/write/exec     [ uvm_aobj ]
0CEDC000    400K read/write/exec     [ anon ]
0CF40000    256K read/write/exec     [ uvm_aobj ]
0CF80000     32K read/write/exec     [ anon ]
0CF90000    192K read/write/exec     [ anon ]
10000000 303104K read/write/exec     [ pt_map ]
 total   515808K

# vmstat -s
     8192 bytes per page
        1 page color
   259566 pages managed
   257652 pages free
      282 pages active
...

Greetings,
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."
-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."