freebsd-questions Digest, Vol 709, Issue 5
galtsev at kicp.uchicago.edu
Thu Jan 11 15:57:10 UTC 2018
On 01/11/18 06:14, Dave B via freebsd-questions wrote:
> That I suspect depends on how many physical address lines are available
> for it via the memory management system.
> If the PC documentation says 8G is the max', then that is probably all
> that'll be seen by the CPU, even if there is 16G installed.
> There is only one way to find out for sure, at your expense.
> Personally, I doubt it, and the info at
> https://support.hp.com/gb-en/document/c03363664 says it wont.
> If it does see 16G (or more) best park it in a corner and thrash it with
> a Live Boot Memtest86 CD for some days, to ensure it's working
> correctly. (Let it run to full completion, it can take hours for a
> full test, even for 4G!)
In addition to memtest86 I would also run much more stressful test,
namely have the machine booted into system, run multiple CPU and RAM
hungry stuff (make buildworld comes to my mind). The reason for that
would be: with signals on memory bus marginally out of specs, system
stress will help them being pushed to the limit, which "unstressful"
memtest86 will not do and may pass, though the failure on stressed
system still may happen.
Just my $0.02
> But even that, doesn’t fully exercise the memory management system in
> the same way an OS will.
> Chances are, if it works at all with the large memory modules, it'll
> only "See" and be able to use 8G.
> Have Fun.
> Dave B.
> On 11/01/18 12:00, freebsd-questions-request at freebsd.org wrote:
>> OT: Max system physical memory
>> Aryeh Friedman <aryeh.friedman at gmail.com>
>> 10/01/18 14:59
>> FreeBSD Mailing List <freebsd-questions at freebsd.org>
>> My computer (HP Pavilion P7-1234, FreeBSD 11.1-RELEASE [amd64]) has 2 240
>> pin DIMM (DDR3, PC3-10600) the manual says the max memory is 8 GB but I see
>> some 16 GB packages (2x8GB). If I put one or two of these in will it see
>> the extra memory?
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Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
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