[dpdk-dev] add support for HTM lock elision for x86
Roman Dementiev
roman.dementiev at intel.com
Tue Jun 2 16:55:30 CEST 2015
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
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