CAMBRIA and more than one atheros card

[hiren panchasara]

On Mon, Jul 7, 2014 at 11:31 AM, Adrian Chadd <adrian at freebsd.org> wrote:
> On 7 July 2014 11:28, John Hay <jhay at meraka.org.za> wrote:
>> On Mon, Jul 07, 2014 at 11:22:46AM -0700, Adrian Chadd wrote:
>>> On 7 July 2014 10:12, Ian Lepore <ian at freebsd.org> wrote:
>>> > On Mon, 2014-07-07 at 09:25 -0700, Adrian Chadd wrote:
>>> >> hi,
>>> >>
>>> >> That call is returning ENOMEM. I'm not sure why. It allocated an mbuf
>>> >> fine, but it couldn't allocate the DMA map.
>>> >>
>>> >> What's the output of "vmstat -z" ? I wonder if it's failing an allocation.
>>> >>
>>> >>
>>> >>
>>> >> -a
>>> >
>>> > Lack of bounce buffers is a posibility that won't show up in vmstat
>>> > output.
>>>
>>> right, but there's a bunch of already failing vmstat entries.
>>>
>>>
>>> John - there's a vmscale parameter somewhere. Hiren had to drop it
>>> down for his APs to work in 64MB of RAM. I think it's
>>> vm.kmem_size_scale . What's it say for you?
>>>
>>
>> :~ # sysctl vm.kmem_size_scale
>> vm.kmem_size_scale: 3
>
> Ok. Search the archives for an email from Hiren titled "mbuf autotuning effect".
>
> TL;DR - set it to 1 and recompile. There's a kernel option somewhere
> to do exactly that.

Yes. http://lists.freebsd.org/pipermail/freebsd-mips/2013-September/003081.html

I went through this for my tplink.

John, can you show o/p of:

sysctl -a | grep hw | grep mem
and
sysctl -a | grep maxmbuf

Cheers,
Hiren