svn commit: r251586 - head/sys/arm/ti

[Alan Cox]

On 06/10/2013 06:08, Olivier Houchard wrote:
> On Mon, Jun 10, 2013 at 06:55:47AM +0300, Konstantin Belousov wrote:
>> On Sun, Jun 09, 2013 at 10:51:12PM +0000, Olivier Houchard wrote:
>>> Author: cognet
>>> Date: Sun Jun  9 22:51:11 2013
>>> New Revision: 251586
>>> URL: http://svnweb.freebsd.org/changeset/base/251586
>>>
>>> Log:
>>>   Increase the maximum KVM available on TI chips. Not sure why we suddenly need
>>>   that much, but that lets me boot with 1GB of RAM.
>> I suspect that the cause is the combination of limited KVA and
>> lack of any limitation for the buffer map. I noted that ARM lacks
>> VM_BCACHE_SIZE_MAX after a report from mav about similar (?) problem a
>> day ago.
>>
>> In essence, the buffer map is allowed to take up to ~330MB when no
>> upper limit from VM_BCACHE_SIZE_MAX is specified.
>
> Hi Konstantin,
>
> Thanks for the hint !
> It seems only i386 and sparc64 sets it, what would be a good value, 200M, as
> it is on i386 ?
>

Since there are many arm platforms with less than 1 GB of kernel virtual
address (KVA) space, VM_BCACHE_SIZE_MAX should be made to scale down
from 200 MB with the available KVA space.  See how VM_KMEM_SIZE_MAX is
currently defined on arm.

Alan