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4e0c8f54f6
VLAN flooding already provides the exact port-VLAN entry associated with
each destination port. Use that entry directly for the egress state check
and VLAN handling instead of resolving it again from the packet VLAN ID.
Keep the existing lookup path for forwarding destinations which do not
provide a port-VLAN entry. This removes two VLAN hash lookups for every
flooded egress port. Use __always_inline for should_deliver as it provides
a measurable 3% additional gain, should_deliver wasn't inlined even though
it had the inline specifier, the bridge module size increases by 173 bytes.
The series were tested in a two CPU VM with packet generation and bridge
forwarding on separate pinned CPUs. The results are medians of seven runs
with 300000 64b tagged broadcast packets.
Mpps br_flood TSC cycles/input
VIDs Ports before after gain before after reduction
1 8/2 1.209298 1.636580 35.3% 1444 845 41.5%
1 8/4 0.843175 0.986541 17.0% 3036 2527 16.8%
1 8/8 0.508857 0.559844 10.0% 5999 5465 8.9%
1 32/2 0.893896 1.586532 77.5% 3013 841 72.1%
1 32/16 0.250567 0.282339 12.7% 13670 11137 18.5%
1 32/32 0.135351 0.148461 9.7% 25429 22320 12.2%
1 64/2 0.555010 1.603776 189.0% 5001 837 83.3%
1 64/32 0.123831 0.149639 20.8% 27674 22602 18.3%
1 64/64 0.069122 0.076047 10.0% 51508 45138 12.4%
64 8/2 1.044185 1.500468 43.7% 1528 851 44.3%
64 8/4 0.802680 0.977700 21.8% 3178 2546 19.9%
64 8/8 0.479748 0.555419 15.8% 6283 5635 10.3%
64 32/2 0.861074 1.561266 81.3% 3063 849 72.3%
64 32/16 0.234011 0.280027 19.7% 14332 11165 22.1%
64 32/32 0.126145 0.148085 17.4% 27225 22613 16.9%
64 64/2 0.530587 1.496179 182.0% 4377 826 81.1%
64 64/32 0.121105 0.147943 22.2% 29286 22541 23.0%
64 64/64 0.063626 0.077051 21.1% 56147 45520 18.9%
1024 8/2 1.008693 1.358408 34.7% 1538 879 42.8%
1024 8/4 0.785636 0.943545 20.1% 3280 2704 17.6%
1024 8/8 0.448194 0.521765 16.4% 6678 6011 10.0%
1024 32/2 0.840864 1.417311 68.6% 2756 859 68.8%
1024 32/16 0.195786 0.247129 26.2% 16269 12639 22.3%
1024 32/32 0.097978 0.122742 25.3% 35249 29273 17.0%
1024 64/2 0.536947 1.400985 160.9% 4421 849 80.8%
1024 64/32 0.093962 0.123383 31.3% 37425 29197 22.0%
1024 64/64 0.045147 0.057867 28.2% 72626 59198 18.5%
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260918152950.1938259-9-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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