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authorNeale Ranns <nranns@cisco.com>2020-10-16 14:03:55 +0000
committerDamjan Marion <dmarion@me.com>2020-10-19 14:34:39 +0000
commit123b5ebb9816e520d3029146ee233826f4e974bc (patch)
tree4fcdc1bb84a8d736d08cefe5f483a93cdbc89553 /src/vnet/ipsec/esp_encrypt.c
parent4769ed9c6b85dd3287adc1b725de8a8bed6a5b0e (diff)
ipsec: Layout and prefetching of SA struct
Type: improvement - collect all DP used variables onto 1st or 2nd cache line - prefetch the 2nd cache line - in encrypt prefetch the likely location of the trailer. Signed-off-by: Neale Ranns <nranns@cisco.com> Change-Id: I44d58f8d2d469ff71a4f4a71578e7cc1acaeba43
Diffstat (limited to 'src/vnet/ipsec/esp_encrypt.c')
-rw-r--r--src/vnet/ipsec/esp_encrypt.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index c0773e2963f..591ec260699 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -624,6 +624,9 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
p -= CLIB_CACHE_LINE_BYTES;
CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
+ /* speculate that the trailer goes in the first buffer */
+ CLIB_PREFETCH (vlib_buffer_get_tail (b[1]),
+ CLIB_CACHE_LINE_BYTES, LOAD);
}
if (is_tun)
@@ -646,6 +649,10 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
current_sa_packets = current_sa_bytes = 0;
sa0 = pool_elt_at_index (im->sad, sa_index0);
+
+ /* fetch the second cacheline ASAP */
+ CLIB_PREFETCH (sa0->cacheline1, CLIB_CACHE_LINE_BYTES, LOAD);
+
current_sa_index = sa_index0;
spi = clib_net_to_host_u32 (sa0->spi);
esp_align = sa0->esp_block_align;