POWER7 Spec

By: Doug Siebert (foo.delete@this.bar.bar), February 9, 2010 10:18 pm
Room: Moderated Discussions
Ian Ameline (ian.ameline@gmail.omitthis.com) on 2/9/10 wrote:
---------------------------
>Linus Torvalds (torvalds@linux-foundation.org) on 2/9/10 wrote:
>---------------------------
>>Linus Torvalds (torvalds@linux-foundation.org) on 2/9/10 wrote:
>>---------------------------
>>>Doug Siebert (foo@bar.bar) on 2/9/10 wrote:
>>>>
>>>>Of course the IPC championship will probably go to Tukwila,
>>>>because it clocks so pathetically low that it has less than
>>>>half as many cycles of latency to cache and DRAM.
>>>
>>>You'd think so, but you'd be wrong. Itanium actually mostly
>>>gets less work done per core and per cycle.
>>>
>>>Just look at the SpecInt numbers. Nehalem beats at least
>>>Montvale by more than the frequency difference. Who
>>>knows about Tukwila, but there's nothing to indicate that
>>>it has improved at a core level.
>>>
>>>And yeah, yeah, it depends a bit on the benchmark. Itanium
>>>does relatively better on hmmer and astar, for example. But
>>>even if you ignore the libquantum results (you should),
>>>Nehalem generally outperforms Itanium even at work-per-cycle.
>>>
>>>Itanium CPI probably looks better if you count all the
>>>instructions that don't actually help (ie speculation,
>>>address generation, nops, whatever). But the only way to
>>>compare CPI across architectures is to look at the actual
>>>work done, not unequal instruction counts, and no,
>>>Itanium doesn't do any more work per cycle.
>>>
>>>In-order really is a dead end if you ever care about
>>>performance. Doing wide instructions just means that
>>>you stall more instructions at a time.
>>>
>>>Linus
>>
>
>Linus, they say that talking to yourself is not necessarily a bad sign, but that
>answering back could be an indication of problems...
>
>:-)
>
>-- Ian.



He seems to reply to himself at least half the time on RWT, but usually he has something to add :)
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TopicPosted ByDate
POWER7 SpecParadox2010/02/08 11:05 AM
  POWER7 SpecThu Nguyen2010/02/08 12:58 PM
    POWER7 SpecIan Ameline2010/02/08 09:22 PM
      POWER7 SpecThu Nguyen2010/02/08 11:54 PM
        POWER7 SpecIan Ameline2010/02/09 06:46 AM
          POWER7 SpecLinus Torvalds2010/02/09 07:57 AM
            industry-standard single-threaded performance benchmarks absentMichael S2010/02/09 08:09 AM
              industry-standard single-threaded performance benchmarks absentParadox2010/02/09 08:33 AM
                industry-standard single-threaded performance benchmarks absentMichael S2010/02/09 09:30 AM
                  industry-standard single-threaded performance benchmarks absentParadox2010/02/09 10:52 AM
                    industry-standard single-threaded performance benchmarks absentJesper Frimann2010/02/09 11:33 AM
              industry-standard single-threaded performance benchmarks absentLinus Torvalds2010/02/09 08:48 AM
                industry-standard single-threaded performance benchmarks absentMichael S2010/02/09 09:26 AM
                  industry-standard single-threaded performance benchmarks absentLinus Torvalds2010/02/09 09:58 AM
                    industry-standard single-threaded performance benchmarks absentJesper Frimann2010/02/09 12:17 PM
                      industry-standard single-threaded performance benchmarks absentLinus Torvalds2010/02/09 12:54 PM
                        industry-standard single-threaded performance benchmarks absentJesper Frimann2010/02/09 02:10 PM
                    industry-standard single-threaded performance benchmarks absentParadox2010/02/09 01:22 PM
                industry-standard single-threaded performance benchmarks absentanon2010/02/09 10:21 AM
            POWER7 SpecJesper Frimann2010/02/09 12:30 PM
            POWER7 SpecDoug Siebert2010/02/09 05:38 PM
              POWER7 SpecLinus Torvalds2010/02/09 07:28 PM
                POWER7 SpecLinus Torvalds2010/02/09 07:28 PM
                  POWER7 SpecIan Ameline2010/02/09 08:02 PM
                    POWER7 SpecDoug Siebert2010/02/09 10:18 PM
                POWER7 Specsomeone2010/02/09 08:20 PM
                  POWER7 SpecLinus Torvalds2010/02/10 09:17 AM
                    POWER7 SpecLinus Torvalds2010/02/10 09:46 AM
                      POWER7 SpecEmil2010/02/10 11:06 AM
                    POWER7 SpecIan Ameline2010/02/10 10:13 AM
                    POWER7 Specsomeone2010/02/10 11:01 AM
                      POWER7 SpecLinus Torvalds2010/02/10 11:32 AM
                        POWER7 SpecMichael S2010/02/10 12:30 PM
                          POWER7 SpecLinus Torvalds2010/02/10 01:25 PM
                            POWER7 Specmpx2010/02/10 02:58 PM
                        POWER7 Specnemlis2010/02/11 12:24 AM
                          POWER7 Specnone2010/02/11 12:52 AM
                            POWER7 Specnemlis2010/02/11 01:52 PM
          POWER7 Specmpx2010/02/09 08:18 AM
          POWER7 SpecMichael S2010/02/09 09:08 AM
        POWER7 SpecJesper Frimann2010/02/16 02:29 AM
          POWER7 SpecJamie Lucier2010/02/16 06:35 AM
            POWER7 Specanon2010/02/16 07:16 AM
              POWER7 SpecJamie Lucier2010/02/16 10:46 AM
                POWER7 Specanon2010/02/16 03:42 PM
                  POWER7 SpecJamie Lucier2010/02/18 06:07 AM
              POWER7 SpecThu Nguyen2010/02/16 01:23 PM
            POWER7 SpecParadox2010/02/16 09:57 AM
              POWER7 SpecJamie Lucier2010/02/16 11:22 AM
                POWER7 SpecParadox2010/02/16 02:00 PM
            POWER7 SpecJesper Frimann2010/02/16 02:14 PM
              POWER7 SpecJamie Lucier2010/02/17 10:41 AM
  POWER7 SpecJesper Frimann2010/02/09 04:43 AM
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