Hello Jay, Tuesday, June 2, 2015, 3:21:24 PM, you wrote:
> On Tue, Jun 2, 2015 at 8:11 AM, Roman Dementiev <roman.dementiev at > intel.com>wrote: > This series of patches adds methods that use hardware memory transactions > (HTM) > on fast-path for DPDK locks (a.k.a. lock elision). Here the methods are > implemented > for x86 using Restricted Transactional Memory instructions (Intel(r) > Transactional > Synchronization Extensions). The implementation fall-backs to the normal > DPDK lock > if HTM is not available or memory transactions fail. It provides a very good scaling given the protected data structure is friendly to HTM. One example is rte_hash which is benchmarked in the unit test I have provided as the last patch. There are some papers showing additional test results with similar lock elision implementations: www.intel.com/software/tsx > This is very interesting. Do you have any summary you can give us > of what the performance implications are from your test data? > > This is not a replacement for lock usages since not all critical sections > protected > by locks are friendly to HTM. > Any pointers to material that describe where HTM in its current incarnation > on x86 is approprate? > > I meant to say: not a replacement to *ALL* lock usages. You can check the material here: www.intel.com/software/tsx Please let me know if you need additional information. > Roman Dementiev (3): > spinlock: add support for HTM lock elision for x86 > rwlock: add support for HTM lock elision for x86 > test scaling of HTM lock elision protecting rte_hash > > app/test/Makefile | 1 + > app/test/test_hash_scaling.c | 223 > +++++++++++++++++++++ > lib/librte_eal/common/Makefile | 4 +- > .../common/include/arch/ppc_64/rte_rwlock.h | 38 ++++ > .../common/include/arch/ppc_64/rte_spinlock.h | 41 ++++ > lib/librte_eal/common/include/arch/x86/rte_rtm.h | 73 +++++++ > .../common/include/arch/x86/rte_rwlock.h | 82 ++++++++ > .../common/include/arch/x86/rte_spinlock.h | 107 ++++++++++ > lib/librte_eal/common/include/generic/rte_rwlock.h | 194 ++++++++++++++++++ > .../common/include/generic/rte_spinlock.h | 75 +++++++ > lib/librte_eal/common/include/rte_rwlock.h | 158 --------------- > 11 files changed, 836 insertions(+), 160 deletions(-) > Thanks! > Jay -- Best regards, Roman mailto:roman.dementiev at intel.com Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen, Deutschland Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Christian Lamprechter, Hannes Schwaderer, Douglas Lusk Registergericht: Muenchen HRB 47456 Ust.-IdNr./VAT Registration No.: DE129385895 Citibank Frankfurt a.M. (BLZ 502 109 00) 600119052