Re: [PATCH] x86_32: trim memory by updating e820 v2
From: Justin Piszcz
Date: Mon Jan 28 2008 - 13:07:46 EST
On Mon, 28 Jan 2008, Ingo Molnar wrote:
* Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote:
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.
thanks for testing it! The code indeed successfully trimmed your memory
map by 64MB:
from:
[ 0.000000] BIOS-e820: 0000000100000000 - 000000022c000000 (usable)
to:
[ 0.000000] modified: 0000000100000000 - 0000000228000000 (usable)
[ 0.000000] modified: 0000000228000000 - 000000022c000000 (reserved)
what happened on your box previously when you booted without any
trimming - did it sometimes slow down or something like that?
Ingo
When I boot the box without any trimming it acts like a 286 or 386, takes
about 10 minutes to boot (using raptor disks).
Justin.
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