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authorSirshak Das <sirshak.das@arm.com>2019-02-05 01:33:33 -0600
committerFlorin Coras <florin.coras@gmail.com>2019-04-16 19:33:21 +0000
commit28aa539f7da7b172d0f35ea9a63f3986939477f7 (patch)
treebe856eb44878b604b2fc93beffb7268db77b457b /src/vnet/session-apps/echo_server.c
parent39d04099467414175803273433c95a96c0276252 (diff)
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 <sirshak.das@arm.com> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Diffstat (limited to 'src/vnet/session-apps/echo_server.c')
-rw-r--r--src/vnet/session-apps/echo_server.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/src/vnet/session-apps/echo_server.c b/src/vnet/session-apps/echo_server.c
index d165fb35e01..4249ed83292 100644
--- a/src/vnet/session-apps/echo_server.c
+++ b/src/vnet/session-apps/echo_server.c
@@ -139,7 +139,7 @@ int
echo_server_builtin_server_rx_callback_no_echo (session_t * s)
{
svm_fifo_t *rx_fifo = s->rx_fifo;
- svm_fifo_dequeue_drop (rx_fifo, svm_fifo_max_dequeue (rx_fifo));
+ svm_fifo_dequeue_drop (rx_fifo, svm_fifo_max_dequeue_cons (rx_fifo));
return 0;
}
@@ -161,10 +161,10 @@ echo_server_rx_callback (session_t * s)
ASSERT (rx_fifo->master_thread_index == thread_index);
ASSERT (tx_fifo->master_thread_index == thread_index);
- max_enqueue = svm_fifo_max_enqueue (tx_fifo);
+ max_enqueue = svm_fifo_max_enqueue_prod (tx_fifo);
if (!esm->is_dgram)
{
- max_dequeue = svm_fifo_max_dequeue (rx_fifo);
+ max_dequeue = svm_fifo_max_dequeue_cons (rx_fifo);
}
else
{
@@ -255,7 +255,7 @@ echo_server_rx_callback (session_t * s)
if (n_written != max_transfer)
clib_warning ("short trout! written %u read %u", n_written, max_transfer);
- if (PREDICT_FALSE (svm_fifo_max_dequeue (rx_fifo)))
+ if (PREDICT_FALSE (svm_fifo_max_dequeue_cons (rx_fifo)))
goto rx_event;
return 0;