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ip: ip4 rewrite prefetch optimization

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Type: improvement

ip4_rewrite_inline_with_gso() did vlib_prefetch_buffer_header() for all nodes.
However it is not necessary for ip-rewrite, it is only needed by ip-midchain.

This patch makes ip4-rewrite prefetches less buffers to save cycles.

Signed-off-by: PiotrX Kleski <piotrx.kleski@intel.com>
Change-Id: Ib82dcb0eda4a2d1d7b8d664f2224d49b72aef50f
This commit is contained in:
PiotrX Kleski
2020-12-09 14:32:26 +01:00
committed by Damjan Marion
parent 32526a42c5
commit b801cd1b31
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/vnet/ip/ip4_forward.c
+5 -2
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@@ -2109,8 +2109,11 @@ ip4_rewrite_inline_with_gso (vlib_main_t * vm,
u32 tx_sw_if_index0, tx_sw_if_index1;
u8 *p;
vlib_prefetch_buffer_header (b[6], LOAD);
vlib_prefetch_buffer_header (b[7], LOAD);
if (is_midchain)
{
vlib_prefetch_buffer_header (b[6], LOAD);
vlib_prefetch_buffer_header (b[7], LOAD);
}
adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];