From: Krzysztof Halasa <khc@pm.waw.pl>
To: Thanasis <thanasis@asyr.hopto.org>
Cc: gentoo-user@lists.gentoo.org,
Dirk Heinrichs <dirk.heinrichs@online.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [gentoo-user] RAM installed vs reported
Date: Fri, 01 Jan 2010 14:38:25 +0100 [thread overview]
Message-ID: <m3vdfmosha.fsf@intrepid.localdomain> (raw)
In-Reply-To: <4B3CF04E.8070603@asyr.hopto.org> (thanasis@asyr.hopto.org's message of "Thu, 31 Dec 2009 20:41:18 +0200")
Thanasis <thanasis@asyr.hopto.org> writes:
>> Depends on the "split" used. With 2 GB : 2 GB you can have all-lowmem
>> 1.5 GB RAM, without CONFIG_HIGHMEM*. 2 GB of per-process address space
>> is usually not a problem.
> How do you implement that? What do you mean 2GB:2GB split ?
See "make menuconfig", Processor type and features -> Memory split. You
need to select "EMBEDDED" and "EXPERIMENTAL" first. What you need for
1.5 GB RAM is VMSPLIT_2G.
The idea is that the CPU address space is divided: ca. 2 GB (in this
configuration) for user space (for each process - instead of 3 GB),
2 GB - 128 MB (or something like that, I don't remember exactly) for
physical RAM, and the last 128 MB or so for PCI devices and other
things.
--
Krzysztof Halasa
next prev parent reply other threads:[~2010-01-01 13:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-30 10:49 RAM installed vs reported Thanasis
[not found] ` <200912301208.54359.dirk.heinrichs@online.de>
2009-12-30 11:26 ` [gentoo-user] " Thanasis
2009-12-31 14:59 ` Krzysztof Halasa
2009-12-31 18:41 ` Thanasis
2010-01-01 13:38 ` Krzysztof Halasa [this message]
2010-01-03 10:09 ` Thanasis
2010-01-03 23:10 ` Krzysztof Halasa
2010-01-04 0:39 ` Thanasis
2010-01-04 1:17 ` Krzysztof Halasa
[not found] ` <c30988c31001040651l8351224l4eb1f1a54610653e@mail.gmail.com>
[not found] ` <4B422A86.3070805@asyr.hopto.org>
2010-01-04 20:01 ` Thanasis
2010-01-04 23:53 ` Krzysztof Halasa
2009-12-30 13:00 ` [SOLVED] " Thanasis
2009-12-31 2:56 ` Bill Davidsen
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