From 28aa539f7da7b172d0f35ea9a63f3986939477f7 Mon Sep 17 00:00:00 2001 From: Sirshak Das Date: Tue, 5 Feb 2019 01:33:33 -0600 Subject: svm_fifo rework to avoid contention on cursize Problems Addressed: - Contention of cursize by producer and consumer. - Reduce the no of modulo operations. Changes: - Synchronization between producer and consumer changed from cursize to head and tail indexes Implications: reduces the usable size of fifo by 1. - Using weaker memory ordering C++11 atomics to access head and tail based on producer and consumer role. - Head and tail indexes are unsigned 32 bit integers. Additions and subtraction on them are implicit 32 bit Modulo operation. - Adding weaker memory ordering variants of max_enq, max_deq, is_empty and is_full Using them appropriately in all places. Perfomance improvement (iperf3 via Hoststack): iperf3 Server: Marvell ThunderX2(AArch64) - iperf3 Client: Skylake(x86) ~6%(256 rxd/txd) - ~11%(2048 rxd/txd) Change-Id: I1d484e000e437430fdd5a819657d1c6b62443018 Signed-off-by: Sirshak Das Reviewed-by: Honnappa Nagarahalli --- src/plugins/tlsmbedtls/tls_mbedtls.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'src/plugins/tlsmbedtls') diff --git a/src/plugins/tlsmbedtls/tls_mbedtls.c b/src/plugins/tlsmbedtls/tls_mbedtls.c index e1262981cc2..6b56f5f0604 100644 --- a/src/plugins/tlsmbedtls/tls_mbedtls.c +++ b/src/plugins/tlsmbedtls/tls_mbedtls.c @@ -443,12 +443,12 @@ mbedtls_ctx_write (tls_ctx_t * ctx, session_t * app_session) ASSERT (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER); - deq_max = svm_fifo_max_dequeue (app_session->tx_fifo); + deq_max = svm_fifo_max_dequeue_cons (app_session->tx_fifo); if (!deq_max) return 0; tls_session = session_get_from_handle (ctx->tls_session_handle); - enq_max = svm_fifo_max_enqueue (tls_session->tx_fifo); + enq_max = svm_fifo_max_enqueue_prod (tls_session->tx_fifo); deq_now = clib_min (deq_max, TLS_CHUNK_SIZE); if (PREDICT_FALSE (enq_max == 0)) @@ -493,12 +493,12 @@ mbedtls_ctx_read (tls_ctx_t * ctx, session_t * tls_session) return 0; } - deq_max = svm_fifo_max_dequeue (tls_session->rx_fifo); + deq_max = svm_fifo_max_dequeue_cons (tls_session->rx_fifo); if (!deq_max) return 0; app_session = session_get_from_handle (ctx->app_session_handle); - enq_max = svm_fifo_max_enqueue (app_session->rx_fifo); + enq_max = svm_fifo_max_enqueue_prod (app_session->rx_fifo); enq_now = clib_min (enq_max, TLS_CHUNK_SIZE); if (PREDICT_FALSE (enq_now == 0)) @@ -520,7 +520,7 @@ mbedtls_ctx_read (tls_ctx_t * ctx, session_t * tls_session) ASSERT (enq == read); vec_reset_length (mm->rx_bufs[thread_index]); - if (svm_fifo_max_dequeue (tls_session->rx_fifo)) + if (svm_fifo_max_dequeue_cons (tls_session->rx_fifo)) tls_add_vpp_q_builtin_rx_evt (tls_session); if (enq > 0) -- cgit 1.2.3-korg