Sandy Bridge GPU article online

Article: Intel's Sandy Bridge Graphics Architecture
By: anon (anon.delete@this.anon.com), August 9, 2011 10:43 pm
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 8/9/11 wrote:
---------------------------
>Kevin G (kevin@cubitdesigns.com) on 8/9/11 wrote:
>---------------------------
>>David Kanter (dkanter@realworldtech.com) on 8/9/11 wrote:
>>---------------------------
>>>
>>>Enjoy, and as always, feedback and comments are encouraged!
>>
>>From the conclusion:
>>
>>"The system integration in Sandy Bridge is quite advanced and is a roadmap for
>>the rest of the industry, namely AMD. In particular, it is clear that sharing the
>>last level cache and unified power management are hugely beneficial to performance and power efficiency.
"
>>
>>These two concerns for AMD's designs have already been discussed and up on AMD's
>>road maps. Their next AMD GPU, Trinity, will feature a VLIW4 core which will still
>>inhere the same communication model but improve upon the >power management features.
>
>Right.
>
>>Their SoC design due in 2013 is set to feature their next >generation of graphics
>>architecture which will fully utilize x86 memory >addressing. Essentially the GPU
>>at that point will be seen as another x86 node in terms of >coherency traffic.
>
>That's not clear at all. I do not believe that AMD will ever use the same strong
>consistency model as x86 for their GPUs. They might make their GPUs potentially
>coherent, but that's very different from using x86 consistency.

Consistency is largely a function of how the store queue and speculative read engine function and interact. So it is quite possible that they will act as a symmetric caching agent but have very weak consistency.

There are weird and wonderful consistency issues that occur in the interconnect and coherency model, such as non-causal consistency, and lack of global sequence and things. But those tend to be associated with big multiprocessors rather than extremely tight on-chip interconnect.

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TopicPosted ByDate
Sandy Bridge GPU article onlineDavid Kanter2011/08/09 02:53 AM
  Sandy Bridge GPU article onlinesJ2011/08/09 06:29 AM
    Sandy Bridge GPU article onlineDavid Kanter2011/08/09 11:11 AM
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    Sandy Bridge GPU article onlineDavid Kanter2011/08/09 11:14 AM
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        Sandy Bridge GPU article onlineDavid Kanter2011/08/09 12:06 PM
          Sandy Bridge GPU article onlineJosh2011/08/09 12:18 PM
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    You're rightDavid Kanter2011/08/19 08:16 PM
      Fixed (NT)David Kanter2011/08/19 08:30 PM
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