Re: [gentoo-user] Re: Package compile failures with "internal compiler error: Segmentation fault".

[Michael <confabulate@kintzios.com>]

[-- Attachment #1: Type: text/plain, Size: 3263 bytes --]

On Sunday 8 September 2024 02:59:04 BST Dale wrote:
> Wols Lists wrote:
> > On 04/09/2024 01:39, Dale wrote:
> >> I've seen that before too.  I'm hoping not.  I may shutdown my rig,
> >> remove and reinstall the memory and then test it for a bit.  May be a
> >> bad connection.  It has worked well for the past couple months tho.
> >> Still, it is possible to either be a bad connection or just going bad.
> > 
> > I've had *MOST* of my self-built systems force me to remove and
> > replace the ram several times before the system was happy.
> > 
> > And when a shop "fixed" my computer for me (replacing a mobo that
> > wasn't broken - I told them I thought it needed a bios upgrade and I
> > was right!) they also messed up the ram. Memory is supposed to go in
> > in matched pairs. So what do they do? One stick in each pair of slots
> > - the thing ran like a sloth on tranquillisers! As soon as I realised
> > what they'd done and put both sticks in the same pair, it was MUCH
> > faster.
> > 
> > Cheers,
> > Wol
> 
> I noticed on the set I had to return, the serial numbers were in
> sequence.  One was right after the other.  I don't know if that makes
> them a matched set or if they run some test to match them. 

Both.  They run a test, if one fails in their hands as opposed to yours, they 
pick up the next module and test that.  So you typically end up with numbers 
in a matched kit which are close enough.


> From my understanding tho, each 'bank' or pair has to be a matched set. 
> I did finally find a set of four but it is a different brand.  From what
> I read to tho, ASUS trains itself each time you boot up.  It finds the
> best setting for each set of memory.  It does say that it is usually set
> to a slower speed tho when all four are installed.

It depends if your MoBo comes with 'daisy chain' or 'T topology' RAM slot 
configuration.  Most consumer grade come with 'daisy chain' configuration and 
ASUS may also have an "Optimem" function/feature as they call it.

With 'daisy chain' you should achieve higher max. frequency if you fit 2 
matched DIMMs in the slots the manual suggests (typically B2 & A2), than if 
you fit 4 DIMMs to achieve the same total RAM size.

With 'T topology' you'll achieve a lower frequency with 2 DIMMs, but a higher 
frequency with 4 DIMMs at the same total RAM size, than you would with a 
'daisy chain' MoBo.

The ASUS "Optimem" is some automagic run by the firmware of their 'daisy 
chain' MoBos in terms of voltage and signal sequencing, to do the best job it 
can when you have 4 DIMMs installed.


> Just have to wait
> and see I guess.  Oh, when I boot the first couple times with new
> memory, it takes quite a bit longer on the BIOS boot screen.  After a
> couple times, it doesn't seem to take so long.  Not sure what, but it
> does something. 

The memory controller on the CPU probes the memory module(s) by varying 
voltage and latency until it achieves a reliable result.  If you have enabled 
DOCP as advised here and if provided in the BIOS also selected the RAM 
frequency of the DIMMs you bought, then the probing ought to take less time:

https://www.asus.com/support/faq/1042256/

Unless ... there's something wrong with the system (power, faulty RAM modules, 
buggy BIOS, etc.).

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 833 bytes --]