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Date:      Fri, 07 Dec 2012 22:44:17 +0100
From:      Andre Oppermann <andre@freebsd.org>
To:        Oleksandr Tymoshenko <gonzo@bluezbox.com>
Cc:        svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, alfred@freebsd.org
Subject:   Re: svn commit: r243631 - in head/sys: kern sys
Message-ID:  <50C26331.6030504@freebsd.org>
In-Reply-To: <50C25A27.4060007@bluezbox.com>
References:  <201211272119.qARLJxXV061083@svn.freebsd.org> <ABB3E29B-91F3-4C25-8FAB-869BBD7459E1@bluezbox.com> <50C1BC90.90106@freebsd.org> <50C25A27.4060007@bluezbox.com>

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On 07.12.2012 22:05, Oleksandr Tymoshenko wrote:
> On 12/7/2012 1:53 AM, Andre Oppermann wrote:
>> On 07.12.2012 10:36, Oleksandr Tymoshenko wrote:
>>>
>>> On 2012-11-27, at 1:19 PM, Andre Oppermann <andre@freebsd.org> wrote:
>>>
>>>> Author: andre
>>>> Date: Tue Nov 27 21:19:58 2012
>>>> New Revision: 243631
>>>> URL: http://svnweb.freebsd.org/changeset/base/243631
>>>>
> .. skipped ..
>>> Andre,
>>>
>>> these changes along with r243631 break booting ARM kernels on devices with 1Gb of memory:
>>>
>>> vm_thread_new: kstack allocation failed
>>> panic: kproc_create() failed with 12
>>> KDB: enter: panic
>>>
>>> If I manually set amount of memory to 512Mb it boots fine.
>>> If you need help debugging this issue or testing possible fixes, I'll be glad to help
>>
>> What is the kmem layout/setup of ARM?  If it is like i386 then maybe
>> the parameters VM_MAX_KERNEL_ADDRESS and VM_MIN_KERNEL_ADDRESS are not
>> correctly set up and the available kmem is assumed to be larger than
>> it really is.
>>
>
> VM_MIN_KERNEL_ADDRESS == 0xc0000000
> VM_MAX_KERNEL_ADDRESS == 0xffffffff
>
> The problem goes away if I copy VM_MAX_AUTOTUNE_MAXUSERS and
> VM_MAX_AUTOTUNE_NMBCLUSTERS lines from i386/include/vmparam.h

VM_MAX_AUTOTUNE_NMBCLUSTERS is unused now and can be garbage collected.
It was only ever defined in i386/include/vmparam.h.

The calculation for maxusers is physpages / (2 * 1024 * 1024 / PAGE_SIZE)
resulting in 512.

> Alfred, should these lines be defined for all 32-bit architectures?

-- 
Andre




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