From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gage Eads Subject: [PATCH 3/3] doc: add NB stack comment to EAL "known issues" Date: Thu, 10 Jan 2019 14:55:38 -0600 Message-ID: <20190110205538.24435-4-gage.eads@intel.com> References: <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 AFDF71B8F9 for ; Thu, 10 Jan 2019 21:56:57 +0100 (CET) In-Reply-To: <20190110205538.24435-1-gage.eads@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" This comment makes users aware of the non-blocking stack option and its caveats. Signed-off-by: Gage Eads --- doc/guides/prog_guide/env_abstraction_layer.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/doc/guides/prog_guide/env_abstraction_layer.rst b/doc/guides/prog_guide/env_abstraction_layer.rst index 929d76dba..9497b879c 100644 --- a/doc/guides/prog_guide/env_abstraction_layer.rst +++ b/doc/guides/prog_guide/env_abstraction_layer.rst @@ -541,6 +541,11 @@ Known Issues 5. It MUST not be used by multi-producer/consumer pthreads, whose scheduling policies are SCHED_FIFO or SCHED_RR. + Alternatively, x86_64 applications can use the non-blocking stack mempool handler. When considering this handler, note that: + + - it is limited to the x86_64 platform, because it uses an instruction (16-byte compare-and-swap) that is not available on other platforms. + - it has worse average-case performance than the non-preemptive rte_ring, but software caching (e.g. the mempool cache) can mitigate this by reducing the number of handler operations. + + rte_timer Running ``rte_timer_manage()`` on a non-EAL pthread is not allowed. However, resetting/stopping the timer from a non-EAL pthread is allowed. -- 2.13.6