OOO hw vs SW&in-order hw

By: Mark Roulo (nothanks.delete@this.xxx.com), September 29, 2009 8:58 am
Room: Moderated Discussions
Linus Torvalds (torvalds@linux-foundation.org) on 9/29/09 wrote:
---------------------------
>And the thing is, in-order hits a huge complexity and
>performance wall. I can't recall anybody ever having done
>more than two-way superscalar, even on things that are
>much easier to decode than x86. There's just not enough of
>an upside to the complexity ....

My recollection of SuperSPARC was that it was 3-issue and in-order.

Wiki claims that UltraSPARC, which came later, was 4-issue and in-order.

Neither of these were particularly noted for their performance, of course ...

One could (if one were being mean) compare the SuperSPARC (1992, came out at 33 and 40 MHz ... I remember this because I was evaluating RISC workstations for purchase at the time) with the Pentium (1993, 60MHz, then quickly got faster). The transistor budgets were similar, but the Pentium *crushed* the SPARC in performance and I don't think it was just because of the register windows and branch-delay slot. The extra SPARC pipeline just didn't add value at all other than in some carefully chosen examples.


-Mark Roulo
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Thoughts and questions on the Cortex A9Gabriele Svelto2009/09/26 01:46 AM
  Thoughts and questions on the Cortex A9none2009/09/26 02:27 AM
    Thoughts and questions on the Cortex A9jeff2009/09/27 04:06 AM
      Thoughts and questions on the Cortex A9Michael S2009/09/27 04:29 AM
        Thoughts and questions on the Cortex A9none2009/09/27 05:01 AM
          Thoughts and questions on the Cortex A9Howard Chu2009/09/27 09:39 AM
      Thoughts and questions on the Cortex A9Wilco2009/09/27 06:03 AM
        Thoughts and questions on the Cortex A9jeff2009/09/27 07:00 AM
          Thoughts and questions on the Cortex A9a reader2009/09/27 07:17 AM
            Thoughts and questions on the Cortex A9David Kanter2009/09/27 07:37 AM
              Thoughts and questions on the Cortex A9a reader2009/09/27 07:46 AM
                Thoughts and questions on the Cortex A9Mat2009/10/01 12:04 PM
                  Thoughts and questions on the Cortex A9Wilco2009/10/01 05:09 PM
                    Thoughts and questions on the Cortex A9anon2009/10/01 07:19 PM
            Thoughts and questions on the Cortex A9RagingDragon2009/09/28 04:11 PM
          Thoughts and questions on the Cortex A9Linus Torvalds2009/09/27 08:05 AM
            OOO hw vs SW&in-order hwno thanks2009/09/27 03:47 PM
              OOO hw vs SW&in-order hwLinus Torvalds2009/09/28 05:22 AM
                OOO hw vs SW&in-order hw?2009/09/28 10:37 AM
                  OOO hw vs SW&in-order hwRagingDragon2009/09/28 04:22 PM
                  OOO hw vs SW&in-order hwMegol2009/09/29 03:35 AM
                OOO hw vs SW&in-order hwAnders Jensen2009/09/28 10:50 PM
                  OOO hw vs SW&in-order hwLinus Torvalds2009/09/29 06:44 AM
                    OOO hw vs SW&in-order hwMark Roulo2009/09/29 08:58 AM
                      OOO hw vs SW&in-order hwLinus Torvalds2009/09/29 09:30 AM
                        3- and 4-issue in-order CPUsMark Roulo2009/09/29 10:06 AM
                          3- and 4-issue in-order CPUsLinus Torvalds2009/09/29 10:29 AM
                          3- and 4-issue in-order CPUsGian-Carlo Pascutto2009/09/29 11:35 PM
                          3- and 4-issue in-order CPUsMichael S2009/09/30 01:01 AM
                    OOO hw vs SW&in-order hwmpx2009/09/30 03:14 AM
                    OOO hw vs SW&in-order hwPun Zu2009/10/02 01:44 AM
                      OOO hw vs SW&in-order hwnone2009/10/02 04:22 AM
                      OOO hw vs SW&in-order hwLinus Torvalds2009/10/02 06:11 AM
                        OOO hw vs SW&in-order hwa reader2009/10/02 08:30 AM
                          OOO hw vs SW&in-order hwLinus Torvalds2009/10/02 08:59 AM
                            MoorestownDavid Kanter2009/10/02 09:59 AM
                              What's the difference between Moorestown and Pine Trail cores?anon2009/10/03 07:37 PM
                              Moorestownnone2009/11/03 03:34 PM
                                MoorestownAnon2009/11/04 02:17 PM
                                  Moorestownnone2009/11/05 12:38 AM
                                    MoorestownDavid Kanter2009/11/05 03:45 PM
                                      MoorestownIntelUser20002009/11/06 03:17 AM
                                      MoorestownAnon2009/11/06 12:51 PM
                                        Moorestownnone2009/11/07 06:07 AM
                            OOO hw vs SW&in-order hwAnon2009/10/02 06:55 PM
                              Cluebat for graphicsDavid Kanter2009/10/02 08:19 PM
                                Cluebat for graphicsAnon2009/10/03 04:45 PM
                                  Cluebat for graphicsDavid Kanter2009/10/04 12:57 AM
                                    Cluebat for graphicsAnon2009/10/04 07:15 PM
                                      Cluebat for graphicsDavid Kanter2009/10/05 02:09 AM
                                        Cluebat for graphicsAnon2009/10/05 02:36 PM
                                          Cluebat for graphicsDavid Kanter2009/10/05 08:54 PM
                                            Cluebat for graphicsAnon2009/10/06 04:58 PM
                              OOO hw vs SW&in-order hwLinus Torvalds2009/10/03 05:58 AM
                            OOO hw vs SW&in-order hwslacker2009/10/02 08:11 PM
                            Linux graphics driversRagingDragon2009/10/03 07:27 PM
                              Linux graphics driversanon2009/10/04 06:15 AM
                                Linux graphics driversnone2009/10/04 09:12 AM
            Thoughts and questions on the Cortex A9jeff2009/09/27 05:31 PM
        Thoughts and questions on the Cortex A9someone2009/09/27 08:30 AM
          Thoughts and questions on the Cortex A9none2009/09/27 09:09 AM
            Thoughts and questions on the Cortex A9Wilco2009/09/27 10:35 AM
              Thoughts and questions on the Cortex A9someone2009/09/27 10:55 AM
                Thoughts and questions on the Cortex A9Wilco2009/09/28 01:08 AM
                  Thoughts and questions on the Cortex A9someone2009/09/28 04:58 AM
                    Thoughts and questions on the Cortex A9none2009/09/28 05:18 AM
                      Thoughts and questions on the Cortex A9someone2009/09/28 06:35 AM
                    Thoughts and questions on the Cortex A9Wilco2009/09/28 07:25 AM
                      Thoughts and questions on the Cortex A9Michael S2009/09/28 10:02 AM
                        Thoughts and questions on the Cortex A9Wilco2009/09/29 12:35 AM
                    Thoughts and questions on the Cortex A9Chuck2009/09/28 06:15 PM
              samplesAM2009/09/27 10:20 PM
                samplesWilco2009/09/28 12:51 AM
                  samplesAM2009/09/28 03:16 AM
              Shrinks and process techDavid Kanter2009/09/29 12:22 AM
            Thoughts and questions on the Cortex A9someone2009/09/27 10:42 AM
              Thoughts and questions on the Cortex A9none2009/09/27 11:52 AM
              Atom to stay in-oder or go OoO?AM2009/09/27 10:09 PM
                Atom to stay in-oder or go OoO?Ungo2009/09/28 04:34 AM
                  Atom to stay in-oder or go OoO?a reader2009/09/28 09:15 AM
                    Atom to stay in-oder or go OoO?anon2009/09/28 06:25 PM
                  Atom to stay in-oder or go OoO?AM2009/09/30 02:32 AM
                    Atom to stay in-oder or go OoO?baxeel2009/09/30 07:25 AM
                      Atom to stay in-oder or go OoO?AM2009/09/30 10:12 PM
                    Atom to stay in-oder or go OoO?Ungo2009/10/01 02:00 AM
                      Atom to stay in-oder or go OoO?AM2009/10/01 04:08 AM
                        Atom to stay in-oder or go OoO?anonymous2009/10/01 04:33 AM
                          Atom to stay in-oder or go OoO?AM2009/10/03 06:24 AM
                        Atom to stay in-oder or go OoO?Pun Zu2009/10/02 12:30 AM
                        Atom to stay in-oder or go OoO?Ungo2009/10/02 12:11 PM
                          Atom to stay in-oder or go OoO?AM2009/10/03 06:22 AM
                            Atom to stay in-oder or go OoO?Ungo2009/10/03 01:53 PM
                              Atom to stay in-oder or go OoO?AM2009/10/04 07:44 AM
                                Atom to stay in-oder or go OoO?David Kanter2009/10/04 10:02 PM
                                  Atom to stay in-oder or go OoO?AM2009/10/05 06:18 AM
                                    Atom to stay in-oder or go OoO?David Kanter2009/10/05 10:12 AM
                                      Atom to stay in-oder or go OoO?AM2009/10/06 03:51 AM
                                        Atom to stay in-oder or go OoO?anonymous2009/10/06 06:58 AM
                                        Do you have any proof?David Kanter2009/10/06 08:58 AM
                                          Do you?AM2009/10/06 10:30 PM
                                            Of course I do!anonymous2009/10/07 04:58 AM
                                              Thanks :-)AM2009/10/08 02:17 AM
                                                Thanks :-)anonymous2009/10/08 04:52 AM
                                                  Thanks :-)AM2009/10/09 02:13 AM
                                                    Thanks :-)anonymous2009/10/09 05:03 AM
                                                    Thanks :-)Foo_2009/10/09 05:47 AM
                                                      Thanks :-)AM2009/10/10 12:15 AM
                                            That's what I thought...David Kanter2009/10/07 08:00 AM
                                              That's what I thought...AM2009/10/08 02:26 AM
                                                That's what I thought...anonymous2009/10/08 05:02 AM
                                                  let's see...AM2009/10/09 02:09 AM
                                                    let's see...anonymous2009/10/09 04:43 AM
                                                      let's see...AM2009/10/09 04:52 AM
                                                        let's see...anonymous2009/10/09 05:15 AM
                                                          let's see...AM2009/10/10 12:18 AM
                Atom to stay in-oder or go OoO?someone2009/09/28 05:09 AM
          I call Trollhobold2009/09/28 03:51 AM
            I call Trollsomeone2009/09/28 05:15 AM
              OT: categories of motivation in a forumhobold2009/09/29 05:01 AM
          Thoughts and questions on the Cortex A9Michael S2009/09/28 09:43 AM
            Thoughts and questions on the Cortex A9a reader2009/09/28 03:12 PM
              Thoughts and questions on the Cortex A9someone else2009/09/28 11:25 PM
                Why Cortex A9?hobold2009/09/29 06:20 AM
                  Why Cortex A9?someone else2009/09/29 09:57 AM
                    Why Cortex A9?Richard Cownie2009/09/29 05:09 PM
                      Why Cortex A9?hobold2009/09/29 11:38 PM
                        Why Cortex A9?Richard Cownie2009/09/30 05:49 AM
                          Why Cortex A9?hobold2009/09/30 06:46 AM
                            Why Cortex A9?none2009/09/30 06:56 AM
                              Marvell Sheeva and plug computingRichard Cownie2009/09/30 08:03 AM
                              Why Cortex A9?Michael S2009/09/30 09:07 AM
                                Why Cortex A9?none2009/09/30 09:40 AM
                                Why Cortex A9?Gabriele Svelto2009/09/30 11:43 AM
                                  ARM architectural licenseDavid Kanter2009/09/30 04:57 PM
                                    ARM architectural licensea reader2009/10/01 06:25 AM
                                      ARM architectural licenseRichard Cownie2009/10/01 07:21 AM
                                Why Cortex A9?slacker2009/09/30 06:12 PM
                                  ARM architectural licenseDavid Kanter2009/09/30 06:16 PM
                                  Why Cortex A9?Michael S2009/10/01 06:45 AM
                                    Why Cortex A9?slacker2009/10/02 01:41 AM
                                      Why Cortex A9?Richard Cownie2009/10/02 09:28 AM
                                        Questions...David Kanter2009/10/02 09:56 AM
                                          Questions...Richard Cownie2009/10/02 10:29 AM
                                            Questions...Wilco2009/10/02 12:05 PM
                                          Questions...slacker2009/10/02 07:51 PM
                                        Why Cortex A9?slacker2009/10/02 07:44 PM
                            Why Cortex A9?David W. Hess2009/09/30 07:42 AM
    Thoughts and questions on the Cortex A9Gabriele Svelto2009/09/28 12:28 AM
  Thoughts and questions on the Cortex A9Wilco2009/09/26 06:38 AM
    Thoughts and questions on the Cortex A9Gabriele Svelto2009/09/28 12:38 AM
      Thoughts and questions on the Cortex A9Costanza2009/10/01 02:45 PM
    Thoughts and questions on the Cortex A9sylt2009/09/28 04:54 AM
      Thoughts and questions on the Cortex A9Wilco2009/09/29 12:15 AM
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