ISSCC Poulson Preview Online

Article: New Itanium Microarchitecture at ISSCC 2011
By: David Kanter (dkanter.delete@this.realworldtech.com), November 17, 2010 12:12 pm
Room: Moderated Discussions
someone (someone@somewhere.com) on 11/17/10 wrote:
---------------------------
>David Kanter (dkanter@realworldtech.com) on 11/17/10 wrote:
>---------------------------
>>First of all, I'd like to give a big thank you to the poster who noticed the ISSCC
>>advance program. The paper title regarding Poulson was a great find and well
>in advance of any one else picking it up.
>>
>>I wrote a short piece that contains my thoughts and speculation on the upcoming
>>Poulson microarchitecture. This is relatively well educated speculation, but speculation
>>nonetheless, and it will be interesting to see the presentation and paper in February.
>>
>>In the mean time, here's the article for everyone to enjoy:
>>http://www.realworldtech.com/page.cfm?ArticleID=RWT111710021604
>>
>>As always, comments and questions are welcome.
>>
>>
>>David
>
>I think Atom may be a preview to the type of MT used
>in Poulson. Atom is a two-issue wide in-order design
>that employs SMT. It will try to issue two instructions
>from the primary thread but if it can't it will try to fill in
>the second slot from the secondary thread.
>
>Poulson will likely operate in a similar way but at the
>level of bundles. It will try to issue up to four bundles
>from the primary thread. It will almost always be able to
>issue two bundles but more than that may be rare unless
>the app is recompiled with Poulson scheduling selected.
>The front end will attempt to fill in unused bundle slots
>from the secondary thread.
>
>This is a big win in two ways. The first is with 2 threads
>running current binaries there'll be 2 independent pairs
>of bundles ready to issue the majority of the time when
>both threads are unstalled. The second way is with true
>fine grained thread interleaving (i.e. SMT) stall cycles
>that dominate low ILP workloads can be mitigated to a
>far greater extent than Montecito/Tukwila's high switch
>penalty SoeMT ever could.

Yes, that was along the lines of what I was thinking for a dynamic thread management policy (i.e. done in HW). Of course, Intel might also leave that up to the software...which would be stupid, but also more philosophically consistent with EPIC.

David
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ISSCC Poulson Preview OnlineDavid Kanter2010/11/17 03:40 AM
  ISSCC Poulson Preview Onlinesavantu2010/11/17 05:25 AM
  ISSCC Poulson Preview Onlinesomeone2010/11/17 08:51 AM
    ISSCC Poulson Preview OnlineLinus Torvalds2010/11/17 09:27 AM
      ISSCC Poulson Preview Onlinesomeone2010/11/17 10:31 AM
        ISSCC Poulson Preview OnlineRichard Cownie2010/11/17 10:55 AM
          ISSCC Poulson Preview OnlineLinus Torvalds2010/11/17 11:30 AM
          ISSCC Poulson Preview Onlinesomeone2010/11/17 11:42 AM
            ISSCC Poulson Preview Onlinea reader2010/11/17 02:07 PM
        ISSCC Poulson Preview OnlineGabriele Svelto2010/11/19 02:52 AM
          ISSCC Poulson Preview Onlinesavantu2010/11/19 05:37 AM
    ISSCC Poulson Preview OnlineDavid Kanter2010/11/17 12:12 PM
      ISSCC Poulson Preview Onlinesomeone2010/11/17 12:40 PM
        ISSCC Poulson Preview OnlineDavid Kanter2010/11/17 02:08 PM
          ISSCC Poulson Preview Onlineajensen2010/11/18 01:24 AM
  ISSCC Poulson Preview Onlinelubemark2010/11/17 09:52 AM
  ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/17 11:41 AM
    ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/17 12:12 PM
      ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/17 05:38 PM
        ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/17 08:03 PM
    ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/17 12:14 PM
      ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/17 02:07 PM
        ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/17 02:59 PM
          ISSCC Poulson Preview Online - OoO not unlikely?sylt2010/11/17 03:26 PM
          ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/17 05:53 PM
            ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/17 08:34 PM
              ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/17 09:22 PM
              ISSCC Poulson Preview Online - OoO not unlikely?Martin Høyer Kristiansen2010/11/18 12:35 AM
                ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/18 01:14 AM
                  ISSCC Poulson Preview Online - OoO not unlikely?Martin Høyer Kristiansen2010/11/18 02:00 AM
          ISSCC Poulson Preview Online - OoO not unlikely?Groo2010/11/18 03:28 PM
            ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/18 09:30 PM
              ISSCC Poulson Preview Online - OoO not unlikely?Doug Siebert2010/11/19 12:06 AM
                ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/19 07:52 AM
                  Negativity and ignorancePaul A. Clayton2010/11/19 06:11 PM
                  rhetoricshobold2010/11/20 05:01 AM
              ISSCC Poulson Preview Online - OoO not unlikely?anonymous2010/11/19 02:17 AM
                ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/19 08:22 AM
                  ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/19 09:26 AM
                    ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/19 11:04 AM
                      ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/19 11:24 AM
                        ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/19 12:05 PM
                          ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/19 01:08 PM
                            ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/20 11:02 AM
                              ISSCC Poulson Preview Online - OoO not unlikely?dc2010/11/20 12:59 PM
                              ISSCC Poulson Preview Online - OoO not unlikely?dc2010/11/20 01:01 PM
                                ISSCC Poulson Preview Online - OoO not unlikely?rwessel2010/11/20 01:27 PM
                                  ISSCC Poulson Preview Online - OoO not unlikely?dc2010/11/21 05:00 PM
                                    single-system single-location != RASanonymous2010/11/21 09:33 PM
                                      single-system single-location != RASdc2010/11/25 12:06 PM
                                        single-system single-location != RASDavid Kanter2010/11/25 01:58 PM
                    CS:SNAREPslacker2010/11/20 04:07 AM
                      CS:SNAREPnone2010/11/20 04:53 AM
                        CS:SNAREPS. Rao2010/11/20 11:20 AM
                      CS:SNAREPGabriele Svelto2010/11/22 07:11 AM
                  ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/19 11:08 AM
                    ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/19 06:51 PM
                      ISSCC Poulson Preview Online - OoO not unlikely?rwessel2010/11/20 01:53 AM
                        ISSCC Poulson Preview Online - OoO not unlikely?dc2010/11/20 12:43 PM
                          ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/20 05:43 PM
                            ISSCC Poulson Preview Online - OoO not unlikely?Foo_2010/11/20 05:56 PM
              ISSCC Poulson Preview Online - OoO not unlikely?Groo2010/11/20 12:59 PM
                P = E/tslacker2010/11/20 11:31 PM
                  P = E/tAndi Kleen2010/11/21 03:02 AM
                ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/21 10:24 AM
                  ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/21 01:07 PM
                    ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/21 04:50 PM
                      ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/21 05:38 PM
                        ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/21 06:27 PM
                          ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/22 08:37 AM
                            ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/22 09:07 AM
                              ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/22 09:25 AM
                                ISSCC Poulson Preview Online - OoO not unlikely?dc2010/11/25 12:22 PM
                                  ISSCC Poulson Preview Online - OoO not unlikely?Richard Cownie2010/11/26 10:44 AM
                              perfAM2010/11/24 03:28 AM
                                perfajensen2010/11/24 03:46 AM
                                perfsomeone2010/11/24 09:59 AM
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                            OOOE and energy efficiencysomeone2010/11/23 12:42 PM
                              OOOE and energy efficiencyDavid Kanter2010/11/23 06:00 PM
                                OOOE and energy efficiencyajensen2010/11/24 01:58 AM
                                  OOOE and energy efficiencyRichard Cownie2010/11/24 10:44 AM
                                    OOOE and energy efficiencyajensen2010/11/24 01:51 PM
                                      OOOE and energy efficiencyRichard Cownie2010/11/24 02:59 PM
                                        OOOE and energy efficiencyajensen2010/11/25 12:20 AM
                              OOOE and energy efficiencyChuck2010/11/23 10:04 PM
    ISSCC Poulson Preview Online - OoO not unlikely?ajensen2010/11/18 12:48 AM
  ISSCC Poulson Preview OnlineMatt Waldhauer2010/11/17 11:50 AM
    ISSCC Poulson Preview OnlineDavid Kanter2010/11/17 12:21 PM
    ISSCC Poulson Preview Onlinesomeone2010/11/17 12:51 PM
      ISSCC Poulson Preview OnlineMatt Waldhauer2010/11/18 07:38 AM
    ISSCC Poulson Preview OnlineDan Downs2010/11/18 10:15 AM
      ISSCC Poulson Preview OnlineMatt Waldhauer2010/11/23 03:19 AM
  OoOE IPFajensen2010/11/22 02:12 AM
    OoOE IPFanon2010/11/22 03:24 AM
      OoOE IPFajensen2010/11/22 03:46 AM
  ISSCC Poulson Preview Online- Abstractlubemark2010/11/22 08:02 AM
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  ISSCC Poulson Preview OnlineTwelve2011/03/23 01:32 PM
    ISSCC Poulson Preview OnlineDaniel Bizó2011/03/24 06:23 AM
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