MESSAGE
| DATE | 2016-05-13 |
| FROM | Ruben Safir
|
| SUBJECT | Re: [Hangout-NYLXS] linux capat laptop cheap | | | Linux laptop ?
|
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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