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| author |   Ray Kinsella <mdr@ashroe.eu> | 2021-11-22 12:08:04 +0000 |
|---|---|---|
| committer | Ray Kinsella <mdr@ashroe.eu> | 2021-11-25 09:04:27 +0000 |
| commit | a0de7807405963d15216f3d89ee1c6edf678946a (patch) | |
| tree | 66112a4af14eab41a9753152d46d5657420c97ee /src/plugins/dpdk | |
| parent | 2711ca710affe0c52bf63e08e0cf0588094e6198 (diff) | |
dpdk: prefetch becomes prefetchw
Changed dpdk-input prefetch of vlib_buffer_t to prefetchw.
vlib_buffer_t was being prefetched without 'ownership', which may
cause a stall when the buffer is subsequently written to. This saves
4 clocks a packet when the buffer is shared a cross cores, and has no
impact when not sharing.
Type: improvement
Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
Change-Id: I317af2a38ef536022e68552351a8507861f62dad
Diffstat (limited to 'src/plugins/dpdk')
| -rw-r--r-- | src/plugins/dpdk/device/node.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/plugins/dpdk/device/node.c b/src/plugins/dpdk/device/node.c index e9615e598bc..2357e399dc8 100644 --- a/src/plugins/dpdk/device/node.c +++ b/src/plugins/dpdk/device/node.c @@ -97,13 +97,13 @@ dpdk_prefetch_buffer_x4 (struct rte_mbuf *mb[]) { vlib_buffer_t *b; b = vlib_buffer_from_rte_mbuf (mb[0]); - clib_prefetch_load (b); + clib_prefetch_store (b); b = vlib_buffer_from_rte_mbuf (mb[1]); - clib_prefetch_load (b); + clib_prefetch_store (b); b = vlib_buffer_from_rte_mbuf (mb[2]); - clib_prefetch_load (b); + clib_prefetch_store (b); b = vlib_buffer_from_rte_mbuf (mb[3]); - clib_prefetch_load (b); + clib_prefetch_store (b); } /** \brief Main DPDK input node |