linux-kernel - Re: [PATCH] x86_32: trim memory by updating e820 v2

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Message-ID: <alpine.DEB.0.999999.0801251858450.4388@p34.internal.lan>
Date:	Fri, 25 Jan 2008 19:01:44 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Yinghai Lu <Yinghai.Lu@....COM>
cc:	Jesse Barnes <jesse.barnes@...el.com>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v2



On Tue, 22 Jan 2008, Yinghai Lu wrote:

> On Monday 21 January 2008 01:37:09 pm Justin Piszcz wrote:
>>
>> On Mon, 21 Jan 2008, Yinghai Lu wrote:
>>
>>> On Monday 21 January 2008 11:14:02 am Justin Piszcz wrote:
>>> please get x86.git
>>>
>>>  git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>>>  cd linux-2.6
>>>  #--------------{ x86.git instructions }---------->
>>>  # Add Linus's tree as a remote
>>>  git remote add linus git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>>>
>>>  # Add Ingo's tree as a remote
>>>  git remote add x86 git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git
>>>
>>>  # With that setup, just run the following to get any changes you
>>>  # don't have.  It will also notice any new branches Ingo/Linus
>>>  # add to their repo.  Look in .git/config afterwards, the format
>>>  # to add new remotes is easy to figure out.
>>>  git remote update
>>>  #-------------------------
>>>  git merge x86/master
>>>  git merge x86/mm
>>>
>>> and apply
>>>
>>> [PATCH] x86_64: check if Tom2 is enabled
>>> http://lkml.org/lkml/2008/1/21/20
>>> [PATCH] x86_64: update e820 instead of updating end_pfn v3
>>> http://lkml.org/lkml/2008/1/21/19
>>> [PATCH] x86_32: trim memory by updating e820 v2
>>> http://lkml.org/lkml/2008/1/21/18
>>>
>>> YH
>>>
>>
>> Thanks, I am all patched up and ready to test, unfortunately one of my disks
>> in my RAID 1 just died, I already filled out the advanced replacement form,
>> I will test when I receive the replacement disk.
>
> please get x86.git and apply
> [PATCH] x86_32: trim memory by updating e820 v3
> http://lkml.org/lkml/2008/1/22/394
>
> Ingo already put other two into the tree.
>
> Thanks
>
> YH
>

Tried it, it worked successfully!

With stock kernel, previous way I had to use it was mem=8832M and top 
showed this:

top - 18:53:52 up 1 min,  2 users,  load average: 1.03, 0.30, 0.10
Tasks: 169 total,   1 running, 168 sleeping,   0 stopped,   0 zombie
Cpu(s):  6.1%us,  2.6%sy,  4.5%ni, 81.3%id,  5.5%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8039464k total,  1288948k used,  6750516k free,     3640k buffers
Swap: 16787768k total,        0k used, 16787768k free,   178528k cached

With kernel you mentioned and use e820 v3:

top - 18:48:13 up 3 min,  6 users,  load average: 1.67, 0.68, 0.25
Tasks: 195 total,   2 running, 193 sleeping,   0 stopped,   0 zombie
Cpu(s): 18.5%us,  1.2%sy,  1.6%ni, 74.8%id,  3.9%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8037668k total,  1438732k used,  6598936k free,     6844k buffers
Swap: 16787768k total,        0k used, 16787768k free,   273928k cached

No append mem= required.

A full dmesg is attached so you can analyze the e820/MTRR mapping.

File: dmesg-e820v3patch.txt.bz2

Justin.

Download attachment "dmesg-e820v3patch.txt.bz2" of type "APPLICATION/octet-stream" (12040 bytes)