MESSAGE
| DATE | 2016-05-16 |
| FROM | From: "Mancini, Sabin (DFS)"
|
| SUBJECT | Re: [Hangout-NYLXS] linux capat laptop cheap | | | Linux laptop /
|
The $199. Thinkpad:
you beat me to the punch, yep 32 bit ( 4 bytes on the CPU register ) can only address 4GB of ram not much nowadays.
Would be interesting to know if this system could be upgraded to all 64-bit.
Android topics recently circulating:
I have a Note II android phone- my gripe: don't know if it is Android or the browser, but while commuting, I load some webpages to read when I go underground into the subway.
But, the device tries to refresh the page I guess, and when it can't ( no signal underground ), it
WIPES OUT THE ALREADY LOADED PAGE, gives a blank screen with some stupid message "can't connect" or similar.
Ok, you can't connect now, but why wipe out a page you've already got ( and used up some data allocation for ) ? ? !
================================================================================================================================
-----Original Message-----
From: hangout [mailto:hangout-bounces-at-nylxs.com] On Behalf Of Paul Robert Marino
Sent: Friday, May 13, 2016 2:02 PM
To: NYLXS Discussions List
Subject: Re: [Hangout-NYLXS] linux capat laptop cheap | | | Linux laptop ? It is Win 7, and 32 bit.
32bit Microsoft Windows can only map the first 3GB of ram!
It can see all 4 but can only practically use the first 3.
This is due to a limitation in 32bit NT kernels internal memory address mapping.
Intel developed a feature where they use the end available ram for the
PCI express bus (yes PCI express uses ram for cache and storing
address lookup tables among other things, typically its the first
512Mb at the begging of the memory address space) instead of the
beginning just mitigate the issue in Microsoft Windows.
Since 32bit binaries use less ram than 64bit binaries its common
practice to install 32bit Microsoft Windows on machines with 4GB or
less ram.
By the way the memory space 64bit is way higher than you think (18.1
extabytes ) but most 64Bit chips including AMD and Intel versions only
implement a 48Bit memory address map to reduce overhead. this means
about 4 pedabytes is the limit but I don't think we will have to
worry about that number for at least 40 years, considering the growth
rate of ram over the past 40 years, but you never know programers are
getting lazier every day :)
For more information look here
https://en.wikipedia.org/wiki/64-bit_computing#Limitations_of_practical_processors
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