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Without packet steering NAT masquarade speed on BCM4908 /jumps/ between
two speeds:
1. 826 Mb/s (±3 Mb/s)
2. 909 Mb/s (±8 Mb/s)
and it never reaches ~940 Mb/s.
Proper packet steering can improve it. Below are testing results for
running iperf TCP traffic from LAN to WAN. They were used to pick up
golden values.
┌──────────┬──────────┬───────────┐
│ eth0 │ br-lan │ speed │
│ rps_cpus │ rps_cpus │ [Mbps] │
├──────────┼──────────┼───────────┤
│ 0 │ 0 │ 743 / 804 │
│ 0 │ 1 │ 738 / 821 │
│ 0 │ 2 │ ✓ 940 │
│ 0 │ 4 │ ✓ 938 │
│ 0 │ 8 │ ✓ 941 │
├──────────┼──────────┼───────────┤
│ 1 │ 0 │ 829 │
│ 1 │ 1 │ 829 │
│ 1 │ 2 │ ✓ 942 │
│ 1 │ 4 │ ✓ 941 │
│ 1 │ 8 │ ✓ 941 │
├──────────┼──────────┼───────────┤
│ 2 │ 0 │ ✓ 942 │
│ 2 │ 1 │ 926 │
│ 2 │ 2 │ ✓ 942 │
│ 2 │ 4 │ ✓ 942 │
│ 2 │ 8 │ ✓ 941 │
├──────────┼──────────┼───────────┤
│ 4 │ 0 │ ✓ 941 │
│ 4 │ 1 │ 925 │
│ 4 │ 2 │ ✓ 941 │
│ 4 │ 4 │ ✓ 941 │
│ 4 │ 8 │ ✓ 941 │
├──────────┼──────────┼───────────┤
│ 8 │ 0 │ ✓ 942 │
│ 8 │ 1 │ 925 │
│ 8 │ 2 │ ✓ 941 │
│ 8 │ 4 │ ✓ 942 │
│ 8 │ 8 │ ✓ 942 │
└──────────┴──────────┴───────────┘
Ref: fcbd39689ebfe ("bcm53xx: enable & setup packet steering")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 57cad53f4e52be987cdd61308ff7d2704baca539)
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