linux-kernel - Re: Does Linux have plan to support memory hole remapping?

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

Date:	Wed, 09 Apr 2008 10:01:59 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Zhao Forrest" <forrest.zhao@...il.com>
Cc:	discuss@...-64.org, linux-kernel@...r.kernel.org,
	yhlu.kernel@...il.com, mingo@...e.hu, ak@...e.de
Subject: Re: Does Linux have plan to support memory hole remapping?

"Zhao Forrest" <forrest.zhao@...il.com> writes:
>
> As we can see from above information that the physical memory in system
> is 32768MB(32GB). However OS is only using about
> (32768-512)MB(MemTotal:     33010240 kB). Does this mean that this
> linux kernel can't use the physical memory remapped
> from (4G-512M, 4G) to (32G, 32G+512M)?

The linux kernel can only use the memory passed to it by the BIOS.
Sometimes they need special BIOS setup options to enable remapping. If
there are no such options and you can't upgrade it you're out of luck

I would suggest you contact your system vendor.

-Andi
--
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/