From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gage Eads Subject: [PATCH 0/3] Add non-blocking stack mempool handler Date: Thu, 10 Jan 2019 14:55:35 -0600 Message-ID: <20190110205538.24435-1-gage.eads@intel.com> Cc: olivier.matz@6wind.com, arybchenko@solarflare.com, bruce.richardson@intel.com, konstantin.ananyev@intel.com To: dev@dpdk.org Return-path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 7A0701B8F9 for ; Thu, 10 Jan 2019 21:56:56 +0100 (CET) List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" For some users, the rte ring's "non-preemptive" constraint is not acceptable; for example, if the application uses a mixture of pinned high-priority threads and multiplexed low-priority threads that share a mempool. This patchset introduces a non-blocking stack mempool handler. Note that the non-blocking algorithm relies on a 128-bit compare-and-swap, so it is limited to x86_64 machines. In mempool_perf_autotest the lock-based stack outperforms the non-blocking handler*, however: - For applications with preemptible pthreads, a lock-based stack's worst-case performance (i.e. one thread being preempted while holding the spinlock) is much worse than the non-blocking stack's. - Using per-thread mempool caches will largely mitigate the performance difference. *Test setup: x86_64 build with default config, dual-socket Xeon E5-2699 v4, running on isolcpus cores with a tickless scheduler. The lock-based stack's rate_persec was 1x-3.5x the non-blocking stack's. Gage Eads (3): eal: add 128-bit cmpset (x86-64 only) mempool/nb_stack: add non-blocking stack mempool doc: add NB stack comment to EAL "known issues" MAINTAINERS | 4 + config/common_base | 1 + doc/guides/prog_guide/env_abstraction_layer.rst | 5 + drivers/mempool/Makefile | 1 + drivers/mempool/nb_stack/Makefile | 30 +++++ drivers/mempool/nb_stack/meson.build | 4 + drivers/mempool/nb_stack/nb_lifo.h | 132 +++++++++++++++++++++ drivers/mempool/nb_stack/rte_mempool_nb_stack.c | 125 +++++++++++++++++++ .../nb_stack/rte_mempool_nb_stack_version.map | 4 + .../common/include/arch/x86/rte_atomic_64.h | 22 ++++ mk/rte.app.mk | 1 + 11 files changed, 329 insertions(+) create mode 100644 drivers/mempool/nb_stack/Makefile create mode 100644 drivers/mempool/nb_stack/meson.build create mode 100644 drivers/mempool/nb_stack/nb_lifo.h create mode 100644 drivers/mempool/nb_stack/rte_mempool_nb_stack.c create mode 100644 drivers/mempool/nb_stack/rte_mempool_nb_stack_version.map -- 2.13.6