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Subject: Re: memory beyond4GB invisible to the system even though 
	CONFIG_HIGHMEM64G=y
From: Yinghai Lu <yinghai@kernel.org>
To: James Kirin <james.kirin40@gmail.com>
Cc: Roland Dreier <rdreier@cisco.com>, linux-kernel@vger.kernel.org
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On Thu, Jan 15, 2009 at 11:50 AM, James Kirin <james.kirin40@gmail.com> wrote:
> Hi Yinghai,
>
>> please do
>> 1. boot linux with "disable_mtrr_trim" in grub.conf etc
>> 2. after booting input:
>> echo "base=0x100000000 size=0x20000000 type=write-back" >/proc/mtrr
>
> Thank you for your suggestion.
>
> Unfortunately, booting with disable_mtrr_trim leads to a kernel panic:
>
> [<c0103abb>] kernel_thread_helper+0x7/0x1c
> ===========
> Code: 0c 31 d2 89 e8 e8 c2 f4 ff ff 89 c3 eb 8e 8b 85 cc 00 00 00 89 44 24 10 83
> bd ec 00 01 00 04 0f 84 cf 00 00 00 8b 9d f0 00 01 00 <8b> 43 10 3b 43 0c 0f 84
> d5 00 00 00 8b 53 10 8b 85 ec 00 01 00
> EIP: [<c026bc2f] hid_parser_main+0xcf/0x290 SS:ESP 0068:f7c2bd7c
> ---[ end trace 34615b445589fbb6 ]---
> Kernel panic - not syncing: Attempted to kill init!
>
> I am attaching the kernel config file. The system boots fine if I
> remove "disable_mtrr_trim" from lilo.conf (and rerun lilo).
>
can you try mem=4g , .., and then mem=6g ...

YH