lkml.org 
[lkml]   [2013]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Use of memmap= to forcibly recover memory in 3GB-4GB range - is this safe?
From
On Tue, Jan 15, 2013 at 6:28 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 01/15/2013 05:47 PM, Alex Villacís Lasso wrote:

>> 2) I have recompiled the kernel to support the memtest parameter. When
>> using it, the extra memory segment appears to be as healthy as other
>> areas of memory. However this might only mean that it is wrapping into
>> healthy low RAM.

memtest should print out about the range.

and if you are using 64bit kernel, it should test all memory
except for range with kernel itself.


>>
>> Is my reasoning sane? Is there a way to know, once and for all, whether
>> the extra "memory" is real and safe to use or not?
>
>
> Maybe you can get memtest86+ to test this phantom memory? But yes, it does
> sound like a BIOS bug.

that may not help, because e820 from bios is not right.

Yinghai
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-01-16 08:42    [W:0.071 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site