Performance analysis of K8 and Core online

Article: Performance Analysis for Core 2 and K8: Part 1
By: David Kanter (dkanter.delete@this.realworldtech.com), October 31, 2008 7:38 am
Room: Moderated Discussions
Michael S (already5chosen@yahoo.com) on 10/30/08 wrote:


>
>O.k. Then more nitpicks:
>
>Chart 2 – System Settings/System Bus you use clock frequency for AMD vs transfer rate for Intel. That's inconsistent.
>It would be better to mention either clock rate vs clock rate, i.e. 1000 MHz vs
>266 MHz or transfer rate vs. transfer rate, i.e. 2000 MT/s vs 1066MT/s.

That's a good point, as soon as I get my PC up and running, I'll try and fix that.

>Also in the same chart you mention nForce 590 SLI as a Northbridge. I'd >rather
>say that the on AMD platform the Northbridge is integrated. nForce chip >better fits thd Southbridge moniker.

Fair enough.

>Same page, Figure 1:
>Merom
>6MB L2 is Penryn, not Merom that you tested.

Whoops, yet another mea culpa.

>Execution port 0 can't do SSE Shuffles.
>
>Execution port 1 can't do SSE MUL, it can do FP/SSE MOVE and Logic + 64-bit fixpoint
>shuffle (or 128bit fixpoint shuffle at reduced performance).
>
>Execution port 2 does complete Integer/FP load, not just Load Address. Memory data
>arrives to the inner core through writeback port 2.

Let me take a look at these a bit more.

>K8:
>Unlike Intel where all external memory/IO accesses travel through L2 cache, > on
>K8's SRQ is actually attached directly to all three caches.
>
>IMHO, you should draw L1 TLBs on the right (system) side of respective data >caches.
>This way you make clear that AMD L1 caches while physically-tagged are >virtually-indexed.
>AMD itself certainly draws L1 TLBs on the system side.

Good point.

>The arrows between the L1D and LSU_1 create an impression that LSUs are >fully symmetric
>and can sustain any combination of loads and stores. That's incorrect. K8 >L1D cache
>could sustain at most one store per clock.

I believe when I characterized it in the barcelona article, I made it clear that stores all go through the 2nd LSU, but that text is no longer attached to the diagram.

David
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TopicPosted ByDate
Performance analysis of K8 and Core onlineDavid Kanter2008/10/29 12:47 AM
  Performance analysis of K8 and Core onlineJames2008/10/29 01:36 AM
    Performance analysis of K8 and Core onlineMatt Sayler2008/10/29 04:37 AM
    Performance analysis of K8 and Core onlineDavid Kanter2008/10/30 11:00 AM
      Performance analysis of K8 and Core onlineMichael S2008/10/30 05:32 PM
        Performance analysis of K8 and Core onlineDavid Kanter2008/10/31 07:38 AM
        Performance analysis of K8 and Core onlineEduardoS2008/10/31 04:36 PM
          Performance analysis of K8 and Core onlineMichael S2008/11/01 07:21 AM
            Performance analysis of K8 and Core onlineEduardoS2008/11/01 10:15 AM
              Performance analysis of K8 and Core onlineanonymous2008/11/01 12:06 PM
              I stay correctedMichael S2008/11/01 12:53 PM
    Performance analysis of K8 and Core onlineDavid Kanter2008/11/08 05:23 PM
  Performance analysis of K8 and Core onlinehobold2008/10/29 05:36 AM
  Performance analysis of K8 and Core onlinerwessel2008/10/29 10:08 AM
    Performance analysis of K8 and Core onlineDavid Kanter2008/10/30 10:48 AM
    Error fixedDavid Kanter2008/11/08 05:22 PM
  I cache fetches.Jouni Osmala2008/10/31 12:10 AM
    I cache fetches.anon2008/10/31 01:57 AM
      I cache fetches.anon.moose2008/10/31 07:06 AM
        I cache fetches.anon2008/10/31 01:32 PM
          I cache fetches.Peter2008/10/31 02:38 PM
            I cache fetches - clarificationPeter2008/10/31 02:50 PM
        instruction fetch vs. icache accessDavid Kanter2008/10/31 05:19 PM
  Performance analysis of K8 and Core onlineHoward Chu2008/10/31 01:39 AM
    Performance analysis of K8 and Core onlineLinus Torvalds2008/10/31 07:08 AM
      Performance analysis of K8 and Core onlineEduardoS2008/10/31 12:11 PM
      Timing sensitive performanceDavid Kanter2008/11/03 08:52 AM
    Performance analysis of K8 and Core onlineDavid Kanter2008/11/01 10:53 PM
      Performance analysis of K8 and Core onlineMichael S2008/11/02 04:12 AM
      Performance analysis of K8 and Core onlineEduardoS2008/11/02 06:47 AM
    Performance analysis of K8 and Core onlineDavid Kanter2008/11/03 10:23 AM
  Shanghai vs Penryn Spec PowerJoe Chang2008/11/09 03:38 PM
    Shanghai vs Penryn Spec PowerEduardoS2008/11/09 04:14 PM
      Shanghai vs Penryn Spec PowerMichael S2008/11/09 05:08 PM
        Shanghai vs Penryn Spec PowerHenrik S2008/11/09 10:52 PM
        Shanghai vs Penryn Spec PowerEduardoS2008/11/10 04:32 AM
          Shanghai vs Penryn Spec PowerMichael S2008/11/10 05:56 AM
            Shanghai vs Penryn Spec PowerEduardoS2008/11/10 11:32 AM
              Shanghai vs Penryn Spec PowerMichael S2008/11/10 04:55 PM
                Shanghai vs Penryn Spec Poweranonymous2008/11/10 07:28 PM
                  Shanghai vs Penryn Spec PowerMichael S2008/11/11 01:32 AM
                    Shanghai vs Penryn Spec Poweranonymous2008/11/11 10:38 AM
                Shanghai vs Penryn Spec Powermpx2008/11/11 01:12 PM
                  Shanghai vs Penryn Spec PowerMichael S2008/11/11 03:39 PM
    Seaburg vs San ClementeMichael S2008/11/09 04:37 PM
      Seaburg vs San ClementeJoe Chang2008/11/09 07:11 PM
    Links to spec.org + commentsHenrik S2008/11/10 02:18 AM
      Links to spec.org + commentsMichael S2008/11/10 03:31 AM
        Links to spec.org + commentsHenrik S2008/11/10 07:09 AM
          Links to spec.org + commentsMichael S2008/11/10 07:58 AM
            Links to spec.org + commentsHenrik S2008/11/10 09:48 AM
      Links to spec.org + commentsEduardoS2008/11/10 04:12 AM
        Links to spec.org + commentsMichael S2008/11/10 06:00 AM
          Links to spec.org + commentspgerassi2008/11/11 09:29 AM
            Links to spec.org + commentsMichael S2008/11/11 10:15 AM
  Performance analysis of K8 and Core onlineaap2008/11/16 04:08 PM
    Performance analysis of K8 and Core onlineDavid Kanter2008/11/16 06:20 PM
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