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authorVratko Polak <vrpolak@cisco.com>2024-02-06 12:45:59 +0100
committerVratko Polak <vrpolak@cisco.com>2024-02-19 12:22:20 +0000
commitccfc24f7451b2b6a6f8eabf735812d45ec4a4bf9 (patch)
tree5fbd436ca3d493bf74df3473dbcaea376bb49e42 /src/vlib/buffer.c
parent8cbf84dce02102ae1e9e6c2545fdea6c5673bc22 (diff)
buffers: bring back cache occupancy improvement
The improvement was removed in 40129, causing 5-40% regressions in AVF tests. There is a memory-speed trade-off, this change prefers speed over memory efficiency. Ideally, the choice should be configurable, but that is not easy to achieve, considering how early is vlib_buffer_main_init called. Type: fix Fixes: 038dad7ef29b0b724071edb5f8cc7a9845584454 Change-Id: I4746f3634abe6d233c9d092a372de05b3d1ae4b6 Signed-off-by: Vratko Polak <vrpolak@cisco.com> (cherry picked from commit 04fd51c03c428859bae949a8294ee0f9c062a44b)
Diffstat (limited to 'src/vlib/buffer.c')
-rw-r--r--src/vlib/buffer.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/vlib/buffer.c b/src/vlib/buffer.c
index 82fe6412781..b5200ba5029 100644
--- a/src/vlib/buffer.c
+++ b/src/vlib/buffer.c
@@ -473,6 +473,10 @@ vlib_buffer_alloc_size (uword ext_hdr_size, uword data_size)
uword alloc_size = ext_hdr_size + sizeof (vlib_buffer_t) + data_size;
alloc_size = round_pow2 (alloc_size, VLIB_BUFFER_ALIGN);
+ /* in case when we have even number of 'cachelines', we add one more for
+ * better cache occupancy */
+ alloc_size |= VLIB_BUFFER_ALIGN;
+
return alloc_size;
}