MESSAGE
| DATE | 2016-05-13 |
| FROM | Ruben Safir
|
| SUBJECT | Re: [Hangout-NYLXS] linux capat laptop cheap | | | Linux laptop ?
|
Oh these are the notes.
http://www.nylxs.com/docs/grad_school/arch/memory_notes.txt.html
Essentially, you need to know what the memory mapping scheme is, but
there is a physical limit.
On 05/13/2016 02:16 PM, Ruben Safir wrote:
> On 05/13/2016 02:02 PM, Paul Robert Marino wrote:
>> This is due to a limitation in 32bit NT kernels internal memory address mapping.
>
>
> This would probably be due to architectural constraints, more or less.
> There is just a limit of how much addressing you can do in 32 bits.
>
> I support of the OS can use an algorthim to expand this, stitching
> together bits.
>
>
> http://www.nylxs.com/docs/grad_school/arch/direct_cache_model.png
> http://www.nylxs.com/docs/grad_school/arch/direct_cache_model_2.png
> http://www.nylxs.com/docs/grad_school/arch/direct_cache_model_3.png
>
> http://www.nylxs.com/docs/grad_school/arch/memory.pdf
> http://www.nylxs.com/docs/grad_school/arch/memory_notes.txt.html
> http://www.nylxs.com/docs/grad_school/arch/direct_cache_model.png
> 230 .52311 TIO - Tag, Index,
> Offset
> 231 111: Memory Map of the
> 232 memory address which
> 233 might be requested by a
> 234 CPU an mapped to a
> Cache.
> 235 __________________________________________________________
> 236 | TAG | Index |Offset |
> 237 |___________________|______________________________|_______|
> 238
> 239 112: Example:
> 240
> 241 Consider a machine with a byte addressable main memory of 2^16 bytes
> 242 and block size of 8 bytes. Assume that a direct mapped cache
> consisting
> 243 of 32 lines is used with this machine.
> 244
> 245 Memory is addressed with 16 bits. 16 bits is 2^16 individual possible
> 246 addresses.
> 247
> 248 Since a block is 8 bytes, and a byte is a word, then 3 bits address the
> 249 offset (2^3).
> 250
> 251 Since there are 32 lines in each cache then 2^5 or 5 bits address the
> 252 index.
> 253
> 254 That leaves 8 bits for the tag. Note that this does NOT include the
> 255 data at the memory address.
> 256
> 257 Suppose the byte with address 0001 1010 0001 1010 is stored in the
> 258 cache. What are the addresses of the other bytes stored along with
> 259 it?
> 260
> 261 1) The first eight are the tag: 0001 1010 : In any line you can
> 262 have ANY tag
>
--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com
DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
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Being so tracked is for FARM ANIMALS and and extermination camps,
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