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News AdvancedMicro launches first 64-bit ARM server chip

Discussion in 'Article Discussion' started by brumgrunt, 27 Apr 2012.

  1. brumgrunt

    brumgrunt New Member

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  2. iwod

    iwod New Member

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    So is it AdvancedMicro or AppliedMicro ?
     
  3. Gareth Halfacree

    Gareth Halfacree WIIGII! Staff Administrator Super Moderator Moderator

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    Bah! Applied, not Advanced. My fault - I was thinking of the AMD (which *is* Advanced Micro) story I was writing afterwards... Fixed now!
     
  4. r3loaded

    r3loaded Well-Known Member

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    Is this a custom implementation of the ARMv8 architecture, or based on an ARM reference design?

    Sent from my GT-I9000 using Tapatalk 2
     
  5. Gareth Halfacree

    Gareth Halfacree WIIGII! Staff Administrator Super Moderator Moderator

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    Every ARM chip in existence is based on an ARM reference design - it's just a question of whether it's hard macro or soft macro. In this case, it's soft macro - so yes, it's about as custom as an ARM chip gets.
     
  6. schmidtbag

    schmidtbag New Member

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    unless there's a significant performance difference when running 64 bit ARM, i think i'd rather just use PAE. PAE in linux doesn't really have any noteworthy performance differences, but you're not limited to 4gb.
     
  7. Gareth Halfacree

    Gareth Halfacree WIIGII! Staff Administrator Super Moderator Moderator

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    Existing ARM server chips - by which I mean the Cortex-A15 - don't need PAE, 'cos they use 48-bit memory addressing (despite still being 32-bit chips.) Each chip supports up to 1TB.
     
  8. KarlFreund

    KarlFreund New Member

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    Let's be clear here: this is an announcement of a working FPGA, not a working chip. But is great to see that the 64-bit ecosystem can now begin the work to get ready for real silicon when it DOES become available. Make no mistake: ARM is coming to the datacenter, and there are indeed plenty of 32 bit applications and workloads (ever hear of Java?) that will start the move 1st (with help from Calxeda!)

    -Karl
     
  9. Combatus

    Combatus Bit-tech Modding + hardware reviews Staff Super Moderator

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    Gareth, I have to admit I just love the way you make hardware virtualisation extensions and heavy integer mathematics sound refreshing and interesting!
     
  10. dicobalt

    dicobalt New Member

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    ARM on a server seems like throwing rocks at a tank. If your hardware and processing demands are that low you would be better served by virtualizing it on an existing machine and save the cost of expensive proprietary ARM servers.
     
  11. Gareth Halfacree

    Gareth Halfacree WIIGII! Staff Administrator Super Moderator Moderator

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    I'm going to choose to assume you meant that seriously. :p
    You're missing the point: the servers these are aimed at do lots of small tasks at the same time; in the power envelope of 16 x86 cores, you can get 512 ARM cores - and thus run 498 more threads. (Numbers pulled from you-know-where for illustration.) Doesn't matter how much you virtualise, if you've got sixteen cores then you're only running sixteen threads simultaneously (modulo tricks like Hyper Threading.)
     
  12. r3loaded

    r3loaded Well-Known Member

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    Yes, and an ARM server like this with (relatively) low performance per core but a high core count makes it especially suitable for tasks that are easy to parallelize but simple to compute such as a web server. Each individual request is straightforward to handle, but handling 500 of them at a time is a lot easier on 500 cores than time-slicing them across 16 cores.

    For computationally intensive work, Xeons obviously still remain the best choice.
     
  13. ch424

    ch424 Design Warrior

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    No, there's three ways of licensing: hard macro (the customer gets a silicon layout that they can send to a foundry), RTL (the customer gets source code they can plug into their own cell libraries and turn into a hard implementation themselves, what you call "soft macro") and architecture license (eg Qualcomm make their own CPUs from the ground up, just using the ARM instruction sets). So to answer r3loaded's question, yes, this is probably a custom implementation, not derived from a reference design.

    LPAE is 48-bit physical addressing.
     
  14. Gareth Halfacree

    Gareth Halfacree WIIGII! Staff Administrator Super Moderator Moderator

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    You're quite right - for some reason I completely forgot about architecture licensing.
     
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