lkml.org 
[lkml]   [2005]   [Oct]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 00/07][RFC] i386: NUMA emulation


--David Lang <david.lang@digitalinsight.com> wrote (on Monday, October 03, 2005 08:13:09 -0700):

> On Mon, 3 Oct 2005, Martin J. Bligh wrote:
>
>> --David Lang <david.lang@digitalinsight.com> wrote (on Monday, October 03, 2005 08:03:44 -0700):
>>
>>> On Mon, 3 Oct 2005, Martin J. Bligh wrote:
>>>
>>>> But that's not the same at all! ;-) PAE memory is the same speed as
>>>> the other stuff. You just have a 3rd level of pagetables for everything.
>>>> One could (correctly) argue it made *all* memory slower, but it does so
>>>> in a uniform fashion.
>>>
>>> is it? I've seen during the memory self-test at boot that machines slow down noticably as they pass the 4G mark.
>>
>> Not noticed that, and I can't see why it should be the case in general,
>> though I suppose some machines might be odd. Got any numbers?
>
> just the fact that the system boot memory test takes 3-4 times as long with 8G or ram then with 4G of ram. I then boot a 64 bit kernel on the system and never use PAE mode again :-)
>
> if you can point me at a utility that will test the speed of the memory in different chunks I'll do some testing on the Opteron systems I have available. unfortunantly I don't have any Xeon systems to test this on.

Mmm. 64-bit uniproc systems, with > 4GB of RAM, running a 32 bit kernel
don't really strike me as a huge market segment ;-)

M.

-
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: 2005-10-03 17:28    [W:1.434 / U:0.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site