linux-kernel - RE: 2.6.32-rc3: low mem - only 378MB on x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <BAY105-W30FA408F4CEAD3C272EC98C3CE0@phx.gbl>
Date:	Tue, 6 Oct 2009 09:50:05 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	<jeff.chua.linux@...il.com>, <linux-kernel@...r.kernel.org>,
	<akpm@...ux-foundation.org>, <hugh@...itas.com>
Subject: RE: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?


 <alpine.LFD.2.01.0910051110200.3432@...alhost.localdomain>
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0



> On Mon=2C 5 Oct 2009=2C Jeff Chua wrote:
>>
>> I've 3 systems with 4GB=2C 16GB and 64GB all running 32bit with these se=
t:
>
> Don't.
>
> 4GB is useable. 8GB is borderline. 16GB+ and nobody will care.
>
>> # with 64GB
>> total used free shared buffers cached
>> Mem: 63995 524 63470 0 4 365
>> Low: 378 32 345
>
> All your low memory is used for the 'struct page' arrays that describe
> everything else.
>
>> Anything I should do?
>
> Use a 64-bit CPU and kernel or limit your memory to 8GB or so. No ifs=2C
> buts and maybe's.
>
> Linus
Even Windows limits the amount of RAM to 16 GB when both PAE and it's 3G/1G=
 split mode is enabled for precisely the same reason.(It defaults to 2G/2G =
split mode)
See this for more info:http://blogs.msdn.com/oldnewthing/archive/2004/08/18=
/216492.aspx

Yuhong Bao 		 	   		  =0A=
_________________________________________________________________=0A=
Hotmail: Free=2C trusted and rich email service.=0A=
http://clk.atdmt.com/GBL/go/171222984/direct/01/=
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/