From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Hunt Subject: [PATCH v8 0/18] distributor library performance enhancements Date: Wed, 1 Mar 2017 07:47:17 +0000 Message-ID: <1488354455-142764-1-git-send-email-david.hunt@intel.com> References: <1487647073-129064-2-git-send-email-david.hunt@intel.com> Cc: bruce.richardson@intel.com To: dev@dpdk.org Return-path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 340082C2B for ; Wed, 1 Mar 2017 15:47:14 +0100 (CET) In-Reply-To: <1487647073-129064-2-git-send-email-david.hunt@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 patch aims to improve the throughput of the distributor library. It uses a similar handshake mechanism to the previous version of the library, in that bits are used to indicate when packets are ready to be sent to a worker and ready to be returned from a worker. One main difference is that instead of sending one packet in a cache line, it makes use of the 7 free spaces in the same cache line in order to send up to 8 packets at a time to/from a worker. The flow matching algorithm has had significant re-work, and now keeps an array of inflight flows and an array of backlog flows, and matches incoming flows to the inflight/backlog flows of all workers so that flow pinning to workers can be maintained. The Flow Match algorithm has both scalar and a vector versions, and a function pointer is used to select the post appropriate function at run time, depending on the presence of the SSE2 cpu flag. On non-x86 platforms, the the scalar match function is selected, which should still gives a good boost in performance over the non-burst API. v8 changes: * Changed the patch set to have a more logical order order of the changes, but the end result is basically the same. * Fixed broken shared library build. * Split down the updates to example app more * No longer changes the test app and sample app to use a temporary API. * No longer temporarily re-names the functions in the version.map file. v7 changes: * Reorganised patch so there's a more natural progression in the changes, and divided them down into easier to review chunks. * Previous versions of this patch set were effectively two APIs. We now have a single API. Legacy functionality can be used by by using the rte_distributor_create API call with the RTE_DISTRIBUTOR_SINGLE flag when creating a distributor instance. * Added symbol versioning for old API so that ABI is preserved. v6 changes: * Fixed intermittent segfault where num pkts not divisible by BURST_SIZE * Cleanup due to review comments on mailing list * Renamed _priv.h to _private.h. v5 changes: * Removed some un-needed code around retries in worker API calls * Cleanup due to review comments on mailing list * Cleanup of non-x86 platform compilation, fallback to scalar match v4 changes: * fixed issue building shared libraries v3 changes: * Addressed mailing list review comments * Test code removal * Split out SSE match into separate file to facilitate NEON addition * Cleaned up conditional compilation flags for SSE2 * Addressed c99 style compilation errors * rebased on latest head (Jan 2 2017, Happy New Year to all) v2 changes: * Created a common distributor_priv.h header file with common definitions and structures. * Added a scalar version so it can be built and used on machines without sse2 instruction set * Added unit autotests * Added perf autotest Notes: Apps must now work in bursts, as up to 8 are given to a worker at a time For performance in matching, Flow ID's are 15-bits If 32 bits Flow IDs are required, use the packet-at-a-time (SINGLE) mode. Performance Gains 2.2GHz Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz 2 x XL710 40GbE NICS to 2 x 40Gbps traffic generator channels 64b packets separate cores for rx, tx, distributor 1 worker - up to 4.8x 4 workers - up to 2.9x 8 workers - up to 1.8x 12 workers - up to 2.1x 16 workers - up to 1.8x [01/18] lib: rename legacy distributor lib files [02/18] lib: create private header file [03/18] lib: add new burst oriented distributor structs [04/18] lib: add new distributor code [05/18] lib: add SIMD flow matching to distributor [06/18] test/distributor: extra params for autotests [07/18] lib: switch distributor over to new API [08/18] lib: make v20 header file private [09/18] lib: add symbol versioning to distributor [10/18] test: test single and burst distributor API [11/18] test: add perf test for distributor burst mode [12/18] examples/distributor: allow for extra stats [13/18] sample: distributor: wait for ports to come up [14/18] examples/distributor: give distributor a core [15/18] examples/distributor: limit number of Tx rings [16/18] examples/distributor: give Rx thread a core [17/18] doc: distributor library changes for new burst API [18/18] maintainers: add to distributor lib maintainers