ARM at Computex

By: Exophase (exophase.delete@this.gmail.com), June 3, 2013 12:02 pm
Room: Moderated Discussions
Wilco (Wilco.Dijkstra.delete@this.ntlworld.com) on June 3, 2013 10:52 am wrote:
> On the other hand the only A15 implementation available until a few weeks ago
> (Exynos 5250) is unlikely to be indicative of all A15 implementations.

No, but it's better than the Silvermont hardware ARM has access to, which is nothing.

> If you compare quad A7 vs dual Atom then yes that appears quite possible. Note the A7 does currently
> clock up to 1.4GHz and is only a little slower than A9 due to a much better memory system.
>

I've seen A7 positioned as ~25% slower than A9 at the same clocks, and a limited amount of benchmark data that supports this. Is there anything better about the memory system outside of the lower latency L2 cache? And where does it clock at 1.4GHz? ARM only says "> 1GHz." Exynos 5410 has a limit of 1.2GHz. Other SoCs I know of are 1GHz.

> According to Samsungs ISSC graph, a quad A7 at 1.2GHz uses ~500mW, or just ~125mW per core.
>

The numbers I gave are also from Samsung (in their kernel source) so the two are in disagreement. It could be that those numbers are for a worse bin.

> Unless you use extra cores of course. Assuming a 1.2GHz A7 is about as fast as a 1GHz
> Atom, a quad A7 at 1.2GHz should be able to match dual Atom with hyperthreading at 2GHz.
> Extrapolating your Atom power figures, Atom would use ~1170mW per core at 2GHz. So it
> would be 2343mW vs 500mW, close to a factor of 5 as claimed by the ARM slide.
>

Aside from that this would only apply to code that scales perfectly with core count it also sounds like it's vastly undershooting the benefit of HT. It's common for it to improve performance on Atom by 40, even 50%. That'd bring the needed clocks for Atom as low as 1.4GHz, which grossly changes the comparison.

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TopicPosted ByDate
ARM at Computexanon2013/06/03 08:54 AM
  ARM at ComputexExophase2013/06/03 09:31 AM
    ARM at ComputexWilco2013/06/03 10:52 AM
      ARM at ComputexExophase2013/06/03 12:02 PM
        ARM at Computexnone2013/06/03 01:28 PM
          ARM at ComputexAlberto2013/06/04 10:41 AM
            ARM at Computexanon2013/06/04 01:36 PM
              ARM at ComputexWilco2013/06/04 03:56 PM
                ARM at ComputexDavid Kanter2013/06/04 04:51 PM
                  ARM at ComputexNobodyatAll2013/06/04 05:53 PM
                  ARM at Computexanon2013/06/04 06:53 PM
        ARM at ComputexWilco2013/06/03 01:47 PM
    ARM at Computexanon2013/06/04 04:03 AM
      ARM at ComputexDavid Kanter2013/06/04 08:16 AM
      ARM at ComputexExophase2013/06/04 10:36 AM
        ARM at ComputexWilco2013/06/04 04:09 PM
          ARM at ComputexNobodyatAll2013/06/04 04:23 PM
          ARM at ComputexDavid Kanter2013/06/04 05:00 PM
            ARM at Computexnone2013/06/05 05:26 AM
              ARM at Computexanon2013/06/05 07:19 AM
              ARM at Computexaaron spink2013/06/05 03:04 PM
                Saltwell Outperforming A15...With Less Power!!!Jason2013/06/07 01:56 PM
                  Saltwell Outperforming A15...With Less Power!!!John2013/06/08 06:28 AM
                    Saltwell Outperforming A15...With Less Power!!!Kevin G2013/06/08 02:18 PM
                      Saltwell Outperforming A15...With Less Power!!!David Kanter2013/06/08 08:43 PM
                      Saltwell Outperforming A15...With Less Power!!!tarlinian2013/06/09 02:00 PM
                        Saltwell Outperforming A15...With Less Power!!!none2013/06/09 03:11 PM
                          Saltwell Outperforming A15...With Less Power!!!none2013/07/10 11:46 AM
                            Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/10 07:59 PM
                              Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/10 10:03 PM
                                Saltwell Outperforming A15...With Less Power!!!anon2013/07/10 10:29 PM
                                  Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/10 11:30 PM
                                    Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/11 01:04 AM
                                      Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 03:10 AM
                                        Saltwell Outperforming A15...With Less Power!!!anon2013/07/11 04:10 AM
                                        Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/11 04:43 AM
                                        Saltwell Outperforming A15...With Less Power!!!Steve2013/07/14 08:10 PM
                                          Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/14 10:55 PM
                                          Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/15 02:03 AM
                                            Saltwell Outperforming A15...With Less Power!!!anon2013/07/16 01:07 AM
                                              Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/16 06:25 AM
                                                Saltwell Outperforming A15...With Less Power!!!none2013/07/16 06:34 AM
                                                Saltwell Outperforming A15...With Less Power!!!Exophase2013/07/16 10:34 AM
                                                  Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/18 02:24 PM
                                                    Saltwell Outperforming A15...With Less Power!!!none2013/07/18 03:26 PM
                                    Saltwell Outperforming A15...With Less Power!!!anon2013/07/11 02:50 AM
                                      Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 11:25 PM
                                        Saltwell Outperforming A15...With Less Power!!!anon2013/07/11 11:45 PM
                                          Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/12 12:10 AM
                                            Saltwell Outperforming A15...With Less Power!!!anon2013/07/12 01:52 AM
                                    Saltwell Outperforming A15...With Less Power!!!Gabriele Svelto2013/07/11 04:20 AM
                                      Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 11:51 PM
                                Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/11 12:02 AM
                                  Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 12:28 AM
                                    Saltwell Outperforming A15...With Less Power!!!none2013/07/11 01:49 AM
                                      Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 03:00 AM
                                        Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 03:02 AM
                                        Saltwell Outperforming A15...With Less Power!!!none2013/07/11 04:44 AM
                                          Saltwell Outperforming A15...With Less Power!!!Michael S2013/07/11 05:33 AM
                                            Saltwell Outperforming A15...With Less Power!!!none2013/07/11 05:58 AM
                                              Saltwell Outperforming A15...With Less Power!!!none2013/07/11 05:59 AM
                                              Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/11 07:40 AM
                                                Saltwell Outperforming A15...With Less Power!!!Michael S2013/07/11 08:34 AM
                                                  Saltwell Outperforming A15...With Less Power!!!none2013/07/11 08:50 AM
                                              Saltwell Outperforming A15...With Less Power!!!Michael S2013/07/11 09:02 AM
                                          Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 10:11 PM
                                      Saltwell Outperforming A15...With Less Power!!!Michael S2013/07/11 04:12 AM
                                        Saltwell Outperforming A15...With Less Power!!!none2013/07/11 04:51 AM
                                          Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/11 05:03 AM
                                            Saltwell Outperforming A15...With Less Power!!!none2013/07/11 05:12 AM
                                              Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/11 07:26 AM
                                                Saltwell Outperforming A15...With Less Power!!!none2013/07/11 08:29 AM
                                                Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/12 04:08 AM
                                                  Saltwell Outperforming A15...With Less Power!!!Michael S2013/07/12 04:25 AM
                                              Saltwell Outperforming A15...With Less Power!!!Klimax2013/07/11 11:55 PM
                                                Saltwell Outperforming A15...With Less Power!!!Megol2013/07/13 07:20 AM
                                    Java/Dalvik benchmarksbakaneko2013/07/11 02:26 AM
                                  Saltwell Outperforming A15...With Less Power!!!Linus Torvalds2013/07/11 10:57 AM
                                    Saltwell Outperforming A15...With Less Power!!!Linus Torvalds2013/07/11 11:20 AM
                                      Saltwell Outperforming A15...With Less Power!!!Ian Ameline2013/07/11 03:20 PM
                                      Saltwell Outperforming A15...With Less Power!!!Sylvain Collange2013/07/12 02:29 AM
                                        Saltwell Outperforming A15...With Less Power!!!Wilco2013/07/12 03:51 AM
                                          Saltwell Outperforming A15...With Less Power!!!Sylvain Collange2013/07/12 06:00 AM
                                      Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/12 03:28 AM
                                        Saltwell Outperforming A15...With Less Power!!!Linus Torvalds2013/07/12 09:11 AM
                                          Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/12 10:12 AM
                                          Saltwell Outperforming A15...With Less Power!!!2013/07/12 10:48 AM
                                            Saltwell Outperforming A15...With Less Power!!!Linus Torvalds2013/07/12 11:14 AM
                                              JIT2013/07/13 05:50 AM
                                                How'd you get this flower symbol as your user name ?anon2013/07/13 09:20 AM
                                                  How'd you get this flower symbol as your user name ?Doug S Ꭳ❂〄☢⚓♜☎♬⚄☠2013/07/13 10:12 AM
                                                JITx2013/07/15 06:43 AM
                                    Not reallyAnon2013/07/11 11:21 AM
                                    consistency, pleaseMichael S2013/07/11 11:22 AM
                                      consistency, pleaseLinus Torvalds2013/07/11 11:52 AM
                                        consistency, pleaseMichael S2013/07/11 02:43 PM
                                          consistency, pleaseLinus Torvalds2013/07/11 03:12 PM
                                            consistency, pleaseMark Roulo2013/07/11 03:54 PM
                                              the discussion was about absence of AVX in Silvermont (NT)Michael S2013/07/11 03:59 PM
                                                the discussion was about absence of AVX in SilvermontMark Roulo2013/07/11 04:19 PM
                                                  the discussion was about absence of AVX in SilvermontLinus Torvalds2013/07/12 09:16 AM
                                                    Thank youMark Roulo2013/07/12 09:58 AM
                                                    the discussion was about absence of AVX in Silvermontanon2013/07/12 10:10 AM
                                                      Not really (again)Anon2013/07/12 10:26 AM
                                                        Not really (again)anon2013/07/12 05:40 PM
                                                    the discussion was about absence of AVX in SilvermontLinus Torvalds2013/07/12 10:31 AM
                                                      you are wrong at about 100% of you saidMichael S2013/07/13 11:22 AM
                                                        you are wrong at about 100% of you saidLinus Torvalds2013/07/13 12:08 PM
                                                          you are wrong at about 100% of you saidMichael S2013/07/13 01:13 PM
                                                            you are wrong at about 100% of you saidLinus Torvalds2013/07/13 02:11 PM
                                                            you are wrong at about 100% of you saidvvid2013/07/13 03:20 PM
                                                              you are wrong at about 100% of you saidMichael S2013/07/14 01:38 AM
                                    Saltwell Outperforming A15...With Less Power!!!anon2013/07/11 06:41 PM
                                    Saltwell Outperforming A15...With Less Power!!!bakaneko2013/07/12 03:22 AM
                  Round 2: Baytrail benchmark (yes Antutu!) crushes Snapdragon 800.sammy2013/07/12 11:28 AM
                    Round 2: AnTuTu scores drop dramatically for AtomWilco2013/07/12 11:59 AM
                      Round 2: AnTuTu scores drop dramatically for AtomSteve2013/07/14 08:16 PM
                        Round 2: AnTuTu scores drop dramatically for AtomKlimax2013/07/14 10:59 PM
                        Round 2: AnTuTu scores drop dramatically for AtomDavid Kanter2013/07/15 01:57 PM
                          Intel is cheating AnTuTuWilco2013/07/15 03:43 PM
                            Intel is cheating AnTuTubakaneko2013/07/15 07:47 PM
                              Intel is cheating AnTuTuLinus Torvalds2013/07/15 08:45 PM
                                Intel is cheating AnTuTubakaneko2013/07/16 02:42 AM
                                  Intel is cheating AnTuTuWilco2013/07/16 03:47 AM
                                    Intel is cheating AnTuTubakaneko2013/07/16 05:50 AM
                                      Intel is cheating AnTuTuWilco2013/07/17 03:33 PM
                                        Intel is cheating AnTuTuKlimax2013/07/17 11:29 PM
                                          Intel is cheating AnTuTunone2013/07/17 11:35 PM
                                            Intel is cheating AnTuTuKlimax2013/07/18 01:41 AM
                                              Intel is cheating AnTuTuanon2013/07/18 02:10 AM
                                                Intel is cheating AnTuTuMichael S2013/07/18 03:39 AM
                                                Intel is cheating AnTuTuWilco2013/07/18 04:07 AM
                                                  Intel is cheating AnTuTunone2013/07/18 04:15 AM
                                                    Intel is cheating AnTuTuWilco2013/07/18 05:18 AM
                                                    Intel is cheating AnTuTuMichael S2013/07/18 06:44 AM
                                                      Intel is cheating AnTuTunone2013/07/18 07:47 AM
                                                        strict aliasingMichael S2013/07/18 08:10 AM
                                                          strict aliasing rules have existed since C89 (NT)Ricardo B2013/07/18 05:28 PM
                                                  Intel is cheating AnTuTuKlimax2013/07/18 11:30 AM
                                                Intel is cheating AnTuTuKlimax2013/07/18 11:39 AM
                                                  Intel is cheating AnTuTuanon2013/07/18 12:05 PM
                                                    Intel is cheating AnTuTuKlimax2013/07/20 12:05 AM
                                                      Intel is cheating AnTuTunone2013/07/20 02:50 AM
                                                  Intel is cheating AnTuTunone2013/07/18 12:38 PM
                                                    Intel is cheating AnTuTuKlimax2013/07/19 11:57 PM
                                  Intel is cheating AnTuTuLinus Torvalds2013/07/16 12:32 PM
                                Intel is cheating AnTuTu2013/07/16 03:16 AM
                                  Intel is cheating AnTuTubakaneko2013/07/16 04:55 AM
                                    Intel is cheating AnTuTuWilco2013/07/17 03:46 PM
                                      Intel is cheating AnTuTubakaneko2013/07/18 02:05 PM
                                      Intel is cheating AnTuTuDavid Kanter2013/07/19 02:31 AM
                          Round 2: AnTuTu scores drop dramatically for Atomanon2013/07/15 04:43 PM
                            Round 2: AnTuTu scores drop dramatically for Atomnone2013/07/16 12:15 AM
                          Round 2: AnTuTu scores drop dramatically for AtomGroo2013/07/16 07:35 AM
        ARM at Computexanon2013/06/04 10:43 PM
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