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IO caching in Intel



 
 
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  #1  
Old September 19th 07, 04:11 PM posted to comp.sys.intel
[email protected]
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Posts: 1
Default IO caching in Intel

Hello,
The programmers manual(IA-32/64) for Intel says, that IO is not
cached. Does this mean that say, when an ethernet packet comes in it
does not get cached in the core's cache?

Thanks.

  #2  
Old September 19th 07, 09:44 PM posted to comp.sys.intel
Eric Gisin
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Posts: 308
Default IO caching in Intel

wrote in message ups.com...
Hello,
The programmers manual(IA-32/64) for Intel says, that IO is not
cached. Does this mean that say, when an ethernet packet comes in it
does not get cached in the core's cache?

It means addressable PCI space in not cached, like NIC buffers and display RAM.
  #3  
Old September 19th 07, 10:32 PM posted to comp.sys.intel
Nate Edel
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Posts: 225
Default IO caching in Intel

Eric Gisin wrote:
wrote in message ups.com...
Hello,
The programmers manual(IA-32/64) for Intel says, that IO is not
cached. Does this mean that say, when an ethernet packet comes in it
does not get cached in the core's cache?


It means addressable PCI space in not cached, like NIC buffers and display RAM.


Are you sure? My assumption would be that it means that the IO port address
space is not cached; the processor has no internal way of knowing whether
something in the regular memory address space is memory-mapped IO (PCI or
otherwise)... that's why you have MTRRs (memory type range registers, IIRC)
which have to be set by the OS or BIOS.

--
Nate Edel http://www.cubiclehermit.com/

"What's the use of yearning for Elysian Fields when you know you can't get
'em, and would only let 'em out on building leases if you had 'em?" (WSG)
 




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