Re: Kernel crash in 2.6.32.6 / bcm1480 with 16k page size

[Guenter Roeck <guenter.roeck@ericsson.com>]

On Fri, Jan 29, 2010 at 03:23:21PM -0500, David Daney wrote:
...
> > To follow up on this - does Octeon have a fixed VM size limit ?
> 
> Yes.  But it is larger than SB1's 44 bits.  For Octeon it is 49 bits.
> 
> 
> > And when you run your tests with larger page sizes, do you have IPV6 
> > enabled ?
> 
> Yes.
> 
> But at 16K pages the VM size is 47 bits, so it is under the limit.
> 
> At 64K pages I am using 2-level page tables for 42 bits of VM space 
> which is again under the limit.
> 
> On SB1 and 3-level tables, you will always exceed the limit for both 16K 
> (47 bits) and 64K (55 bits) page sizes.
> 
Ok, based on this info I'll send out a proposed patch shortly.

Guenter