9.1 minimal ram requirements

[Sergey Kandaurov]

On 23 December 2012 03:40, Marten Vijn <info at martenvijn.nl> wrote:
> On 12/23/2012 12:27 AM, Jakub Lach wrote:
>>
>> Guys, I've heard about some absurd RAM requirements
>> for 9.1, has anybody tested it?
>>
>> e.g.
>>
>> http://forums.freebsd.org/showthread.php?t=36314
>
>
> jup, I can comfirm this with nanobsd (cross) compiled
> for my soekris net4501 which has 64 MB mem:
>
> from dmesg: real memory  = 67108864 (64 MB)
>
> while the same config compiled against a 9.0 tree still works...
>

This (i.e. the "kmem_map too small" message seen with kernel memory
shortage) could be due to CAM CTL ('device ctl' added in 9.1), which is
quite a big kernel memory consumer.
Try to disable CTL in loader with kern.cam.ctl.disable=1 to finish boot.
A longer term workaround could be to postpone those memory allocations
until the first call to CTL.

# cam ctl init allocates roughly 35 MB of kernel memory at once
# three memory pools, somewhat under M_DEVBUF, and memory disk
# devbuf takes 1022K with kern.cam.ctl.disable=1

         Type InUse MemUse HighUse Requests  Size(s)
       devbuf   213 20366K       -      265  16,32,64,128,256,512,1024,2048,4096
       ctlmem  5062 10113K       -     5062  64,2048
       ctlblk   200   800K       -      200  4096
      ramdisk     1  4096K       -        1
      ctlpool   532   138K       -      532  16,512

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