Article: Haswell TM Alternatives

Article: Haswell Transactional Memory Alternatives
By: David Kanter (, August 21, 2012 10:17 pm
Room: Moderated Discussions
We previously theorized that Intel’s TSX extensions in Haswell use the caches to provide transactional memory semantics. This article describes an alternative approach based on minimal changes to the CPU core (specifically in the ROB and MOB), contrasts the advantages of the two techniques and discusses the expected implementation in Haswell.

I also muse a bit about when these two techniques (cache-based and MOB-based TM) will get implemented on the roadmap and how they can work together in a very complimentary fashion.

As always comments and discussion welcome.

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TopicPosted ByDate
Article: Haswell TM AlternativesDavid Kanter2012/08/21 10:17 PM
  Article: Haswell TM AlternativesHåkan Winbom2012/08/22 12:52 AM
    Article: Haswell TM AlternativesDavid Kanter2012/08/22 02:06 AM
  Article: Haswell TM Alternativesanon2012/08/22 09:46 AM
    Article: Haswell TM AlternativesLinus Torvalds2012/08/22 10:16 AM
      Article: Haswell TM AlternativesDoug S2012/08/24 09:34 AM
    AMD's ASF even more limitedPaul A. Clayton2012/08/22 10:20 AM
      AMD's ASF even more limitedLinus Torvalds2012/08/22 10:41 AM
        Compiler use of ll/sc?Paul A. Clayton2012/08/28 10:28 AM
          Compiler use of ll/sc?Linus Torvalds2012/09/08 01:58 PM
            Lock recognition?Paul A. Clayton2012/09/10 02:17 PM
              Sorry, I was confusedPaul A. Clayton2012/09/13 11:56 AM
  Filter to detect store conflictsPaul A. Clayton2012/08/22 10:19 AM
  Article: Haswell TM Alternativesbakaneko2012/08/22 03:02 PM
    Article: Haswell TM AlternativesDavid Kanter2012/08/22 03:45 PM
      Article: Haswell TM Alternativesbakaneko2012/08/22 10:56 PM
  Cache line granularity?Paul A. Clayton2012/08/28 10:28 AM
    Cache line granularity?David Kanter2012/08/31 09:13 AM
      A looser definition might have advantagesPaul A. Clayton2012/09/01 07:29 AM
    Cache line granularity?rwessel2012/08/31 08:54 PM
      Alpha load locked granularityPaul A. Clayton2012/09/01 07:29 AM
        Alpha load locked granularityanon2012/09/02 06:23 PM
          Alpha pages groupsPaul A. Clayton2012/09/03 05:16 AM
  An alternative implementationMaynard Handley2012/11/20 10:52 PM
    An alternative implementationbakaneko2012/11/21 06:52 AM
      Guarding unread values?Paul A. Clayton2012/11/21 09:39 AM
        Guarding unread values?bakaneko2012/11/21 12:25 PM
    TM granularity and versioningPaul A. Clayton2012/11/21 09:27 AM
      TM granularity and versioningMaynard Handley2012/11/21 11:52 AM
        Indeed, TM (and coherence) has devilish details (NT)Paul A. Clayton2012/11/21 11:56 AM
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