Memory interfaces

Article: 8-Socket Commodity Servers: Flourish or Perish?
By: David Kanter (dkanter.delete@this.realworldtech.com), March 15, 2010 2:17 pm
Room: Moderated Discussions
slacker (s@lack.er) on 3/15/10 wrote:
---------------------------
>Michael S (already5chosen@yahoo.com) on 3/15/10 wrote:
>---------------------------
>>Thinking about it, aggregate memory bandwidth delivered as lot of independent streams
>>is something that money+power+latency could buy, even within physical limitations
>>of a single socket. Imagine a true serial solution, not glorified parallel, like
>>HT3/QPI/FBD, not multilane serial, like IB/PCIe/XAUI, but a true serial like 10GBASE-T
>>just, say 25% slower and reaching 100cm instead of 100m. With a lot of engineering
>>effort it should be possible to build such phy under 0.5W. 256 channels like that
>>should comfortably fit in 1500-pin package. With 256B packets each channel would deliver 900 MB/s with 90% efficiency.
>>At 64 cores there are 4 channels per core = 3.2 GB/s as measured by Stream. That's
>>close to what we have today in Nehalem-EP, better than Shanghai and significantly better than Nehalem-EX and Istanbul.
>
>I assumed that any memory interface that resembles >something in a Rambus patent
>was off-limits, because that is how industry is treating >serialized memory interfaces.

If you are directly accessing the memory that may be the case. There's no reason you couldn't use a buffer on board type solution. The pin count is a problem at the memory controller, not at the DRAM.

>I was initially skeptical of your idea, but your mention >of XAUI made me realize
>that your approach can probably work (100cm seems >unnecessarily long, though). I
>still think that anything resembling a serialized memory >interface would send Rambus' lawyers in to a frenzy.

Given that FBD isn't being attacked by Rambus, I think you can work around this issue. It may add a little latency, but it's feasible.

David
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
New article: 8 socket commodity serversDavid Kanter2010/03/09 11:27 AM
  New article: 8 socket commodity serversVincent Diepeveen2010/03/09 02:46 PM
    number of sockets is wrong metric (was: New article: 8 socket commodity servers)longtimelurker2010/03/14 06:13 AM
      number of sockets is wrong metric (was: New article: 8 socket commodity servers)EduardoS2010/03/14 06:34 AM
      number of sockets is wrong metric (was: New article: 8 socket commodity servers)Wes Felter2010/03/14 11:33 AM
        Magny-CoursMax2010/03/14 05:56 PM
          Magny-Coursanonymous2010/03/14 07:33 PM
            Magny-Courslongtimelurker2010/03/15 03:54 AM
      number of sockets is wrong metric (was: New article: 8 socket commodity servers)Vincent Diepeveen2010/03/14 12:31 PM
        number of sockets is wrong metric (was: New article: 8 socket commodity servers)longtimelurker2010/03/14 02:37 PM
          number of sockets is wrong metric (was: New article: 8 socket commodity servers)Vincent Diepeveen2010/03/15 12:36 PM
      number of sockets is wrong metric (was: New article: 8 socket commodity servers)David Kanter2010/03/14 12:56 PM
        Bad mathDavid Kanter2010/04/01 02:24 AM
      number of sockets is wrong metric (was: New article: 8 socket commodity servers)slacker2010/03/14 03:51 PM
        number of sockets is wrong metric (was: New article: 8 socket commodity servers)Michael S2010/03/15 06:05 AM
          number of sockets is wrong metric (was: New article: 8 socket commodity servers)slacker2010/03/15 02:02 PM
            Memory interfacesDavid Kanter2010/03/15 02:17 PM
              Memory interfacesslacker2010/03/15 10:08 PM
                Patents on tiny components vs. large, complex thingsmpx2010/03/16 12:41 AM
                  Patents on tiny components vs. large, complex thingsRichard Cownie2010/03/16 06:58 AM
                    Patents on tiny components vs. large, complex thingsMS2010/03/17 06:42 PM
                      Patents on tiny components vs. large, complex thingsa reader2010/03/18 09:45 PM
          Serial Port Memory TechnologyDavid Hess2010/03/21 04:32 AM
  New article: 8 socket commodity serversMichael S2010/03/09 04:13 PM
    New article: 8 socket commodity serverstheluketaylor2010/03/09 06:32 PM
    New article: 8 socket commodity serversJesper Frimann2010/03/09 11:35 PM
    New article: 8 socket commodity serversDavid Kanter2010/03/10 01:38 AM
      New article: 8 socket commodity serversTim2010/03/16 09:44 AM
  New article: 8 socket commodity serversanon2010/03/09 07:59 PM
    New article: 8 socket commodity serversDavid Kanter2010/03/10 12:06 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell green?