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paulb787
Apprentice
Joined: 14 Nov 2005
Posts: 250
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 Posted: Thu Oct 13, 2011 5:43 am Post subject: showing 7.7 vs 8GB of memory? |
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why is gnome system monitor only showing 7.7 vs 8GB of memory?
cat /proc/mtrr
| Quote: | reg00: base=0x000000000 ( 0MB), size= 8192MB, count=1: write-back
reg01: base=0x200000000 ( 8192MB), size= 1024MB, count=1: write-back
reg02: base=0x0bb800000 ( 3000MB), size= 8MB, count=1: uncachable
reg03: base=0x0bc000000 ( 3008MB), size= 64MB, count=1: uncachable
reg04: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
reg05: base=0x23fe00000 ( 9214MB), size= 2MB, count=1: uncachable
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5909
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| Posted: Thu Oct 13, 2011 7:36 am Post subject: |
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because it is better for business to write 8G (in decimal) instead of 7.7G in size.
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein |
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s_bernstein
Apprentice
Joined: 11 Mar 2006
Posts: 172
Location: Bremen, Germany
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| Posted: Thu Oct 13, 2011 1:24 pm Post subject: |
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We are talking about RAM here, and that is, as far as I know, always calculated in base2 units. Only the storage supplies need to fool their customers.
Your RAM is showing as 7.7G instead of 8G because there are some parts of your RAM allocated by other hardware (graphics, network, storage) and is therefore unavailable as RAM. You can argue, that they should display 8G of RAM with 300M reserved / inaccessable / unavailable or whateever, but they don't. If I remember correctly this has historical / technical reason. |
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6920
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| Posted: Fri Oct 14, 2011 1:30 pm Post subject: |
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| The kernel is using 300MB of non-freeable RAM. It'll say the same in top, free, htop, etc. |
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Kernel & Hardware
