From: Yuhong Bao <yuhongbao_386@hotmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <jeff.chua.linux@gmail.com>, <linux-kernel@vger.kernel.org>,
<akpm@linux-foundation.org>, <hugh@veritas.com>
Subject: RE: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?
Date: Tue, 6 Oct 2009 09:50:05 -0700 [thread overview]
Message-ID: <BAY105-W30FA408F4CEAD3C272EC98C3CE0@phx.gbl> (raw)
In-Reply-To: <alpine.LFD.2.01.0910051110200.3432@localhost.localdomain>
<alpine.LFD.2.01.0910051110200.3432@localhost.localdomain>
Content-Type: text/plain; charset="iso-8859-1"
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> 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/=
next prev parent reply other threads:[~2009-10-06 16:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-05 15:57 Jeff Chua
2009-10-05 18:12 ` Linus Torvalds
[not found] ` <b6a2187b0910051715y4ee63503y148ba2d7e24cad8e@mail.gmail.com>
2009-10-06 0:30 ` Linus Torvalds
2009-10-06 10:06 ` Tvrtko Ursulin
2009-10-06 11:01 ` Frans Pop
2009-10-14 21:32 ` Lennart Sorensen
2009-10-06 12:59 ` David Woodhouse
2009-10-06 14:26 ` Linus Torvalds
2009-10-11 9:08 ` Benjamin Herrenschmidt
[not found] ` <b6a2187b0910052312o662642b2teded3d19548b9151@mail.gmail.com>
2009-10-06 14:35 ` Linus Torvalds
[not found] ` <b6a2187b0910080926x303d3c9em8f70632fb19b6509@mail.gmail.com>
2009-10-08 16:35 ` Dave Hansen
[not found] ` <b6a2187b0910090928r648169dax86178a3e8b8c2f21@mail.gmail.com>
2009-10-10 18:10 ` Valdis.Kletnieks
2009-10-10 18:37 ` Linus Torvalds
2009-10-11 9:06 ` Benjamin Herrenschmidt
2009-10-11 17:34 ` Linus Torvalds
2009-10-06 16:50 ` Yuhong Bao [this message]
2009-10-05 18:42 ` Byron Stanoszek
2009-10-05 19:15 ` Dave Hansen
2009-10-05 19:42 Tomasz Chmielewski
2009-10-05 20:31 ` Valdis.Kletnieks
[not found] <drYiu-Pj-15@gated-at.bofh.it>
2009-10-05 20:05 ` Daniel J Blueman
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