lkml.org 
[lkml]   [2007]   [Nov]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: x86_64 ten times slower than i386
Bo Brantén wrote:
> On Sat, 3 Nov 2007, Matt Mackall wrote:
>
>> This is typically due to a problem with the setup of your MTRRs. Try
>> booting with mem=nnnM where nnn is some number smaller than your
>> actual amount of memory.
>
> Thank you for that advice, the system has 4GB and if I boot with
> mem=3072M it will run as fast as normal while if I don't use the mem
> option it will run 10 times slower, however if I use a figure like
> mem=3500M the kernel will panic, is there any way to determine the
> highest usable figure without try and error?

Yes, look at how your MTRRs are set up (cat /proc/mtrr).

-hpa
-
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: 2007-11-04 00:33    [W:0.082 / U:1.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site