Skip site navigation (1)Skip section navigation (2)
Date:      Wed, 25 Apr 2007 02:21:34 +0200
From:      Solon Luigi Lutz <solon@pyro.de>
To:        freebsd-questions@freebsd.org
Subject:   Re[2]: Memory >3.5GB not used?
Message-ID:  <488507560.20070425022134@pyro.de>
In-Reply-To: <20070424182027.33d16b28.wmoran@potentialtech.com>
References:  <01d301c78699$d6a36820$0300020a@mickey> <20070424140528.95287ff4.wmoran@potentialtech.com> <021201c7869f$ee90fd70$0300020a@mickey> <3ee9ca710704241144n4ab349c6m901586e427b1ae0d@mail.gmail.com> <021c01c786a0$fe7e5510$0300020a@mickey> <20070424145433.734761db.wmoran@potentialtech.com> <f0lrup$18a$1@sea.gmane.org> <20070424182027.33d16b28.wmoran@potentialtech.com>

next in thread | previous in thread | raw e-mail | index | archive | help
Hello Bill,

Wednesday, April 25, 2007, 12:20:27 AM, you wrote:
>> >
>> > Not all modules work with PAE.  Read the example PAE kernel file for
>> > information.
>> > 
>> > PAE is an awful hack, BTW.  I've heard a number of people complain that
>> > performance sucks under PAE.
>> 

BM> Does this test demonstrate usage of memory over 4G?  It's my understanding
BM> that PAE starts to suffer when it has to look at the memory over 4G (which
BM> is the problem it's intended to solve)

BM> If your entire test fits in under 4G, you're not seeing the worst of it.
BM> At least, that's my understanding of the issue.

Don't mind - since you don't want to use PAE.
There are a bunch of devices, namely network cards, who will
cease to work properly on a SMP PAE kernel.
Get a AMD64 motherboard or limit the amount of PCI cards to the
absolute minimum; depending on how many/what cards you have installed,
they allocate more or less memory out of the possible 4 GB PCI mem-space.


Best regards,

 Solon Lutz


+-----------------------------------------------+
| PyroDesign Berlin  -  Creativity for tomorrow |
| Wasgenstrasse 75/13  -  14129 Berlin, Germany |
| www.pyro.de  -  phone + 49 - 30 - 48 48 58 58 |
| info@pyro.de  -   fax + 49 - 30 - 80 94 03 52 |
+-----------------------------------------------+                         mailto:solon@pyro.de




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?488507560.20070425022134>