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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/http_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/http_server.c')
-rw-r--r--src/vnet/session-apps/http_server.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/vnet/session-apps/http_server.c b/src/vnet/session-apps/http_server.c
index 4547a4dc4ef..c7e06bfbb2d 100644
--- a/src/vnet/session-apps/http_server.c
+++ b/src/vnet/session-apps/http_server.c
@@ -503,7 +503,7 @@ session_rx_request (http_session_t * hs)
int n_read;
cursize = vec_len (hs->rx_buf);
- max_dequeue = svm_fifo_max_dequeue (hs->rx_fifo);
+ max_dequeue = svm_fifo_max_dequeue_cons (hs->rx_fifo);
if (PREDICT_FALSE (max_dequeue == 0))
return -1;
@@ -511,7 +511,7 @@ session_rx_request (http_session_t * hs)
n_read = app_recv_stream_raw (hs->rx_fifo, hs->rx_buf + cursize,
max_dequeue, 0, 0 /* peek */ );
ASSERT (n_read == max_dequeue);
- if (svm_fifo_is_empty (hs->rx_fifo))
+ if (svm_fifo_is_empty_cons (hs->rx_fifo))
svm_fifo_unset_event (hs->rx_fifo);
_vec_len (hs->rx_buf) = cursize + n_read;