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

To: David Daney <ddaney@caviumnetworks.com>
Subject: Re: Kernel crash in 2.6.32.6 / bcm1480 with 16k page size
From: Guenter Roeck <guenter.roeck@ericsson.com>
Date: Fri, 29 Jan 2010 14:19:08 -0800
Cc: Ralf Baechle <ralf@linux-mips.org>, "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
In-reply-to: <4B6343B9.2010105@caviumnetworks.com>
References: <20100129132406.GD5685@linux-mips.org> <20100129151220.GA3882@ericsson.com> <4B6316D2.1060006@caviumnetworks.com> <20100129180619.GA20113@linux-mips.org> <20100129183926.GB9895@ericsson.com> <4B632F60.4000604@caviumnetworks.com> <20100129192532.GA11123@ericsson.com> <4B6336F1.8070208@caviumnetworks.com> <20100129200013.GD11123@ericsson.com> <4B6343B9.2010105@caviumnetworks.com>
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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


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