FreeBSD on the AP121 (AR9330)

[Warner Losh]

On Mar 27, 2013, at 12:23 PM, Adrian Chadd wrote:

> On 27 March 2013 10:16, Ian Lepore <ian at freebsd.org> wrote:
> 
>> For starters you might try disabling WITNESS and other things you can't
>> afford in a slimmed-down kernel.  On the other hand, kernel bloat is
> 
> Well, the only thing I can't really afford here is the -head
> debugging. But it doesn't actually slim down things significantly.
> I'll re-post the sizes later.

Maybe if you posted the config file, I can tell you what you're missing.

>> If the system isn't doing heavy IO, try "option NBUF=128" to seriously
>> slim down the amount of memory for buffers (by default it'll use 1/4 of
>> total ram up to 64MB).  It would be nice to know more about the
>> implications of tweaking this number, but when I asked on a mailing list
>> once I didn't get much useful info.
> 
> There's that; I think the problem here is deadlock if there's not
> enough buffers available. Guess that bug should be fixed.
> 
> The other immediate thing is the umtx hash array. It's rather large
> (512) and it doesn't need to be.
> 
> I haven't even started with the subsystem memory allocations yet
> either. They get even scarier.
> 
> (And userland is doubly-scary on this platform. Sigh.)

Can't comment here...

Warner