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net/flowtrack: optimize Tuple type for use as map key

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This gets UDP filter overhead closer to TCP. Still ~2x, but no longer ~3x.

    goos: darwin
    goarch: arm64
    pkg: tailscale.com/wgengine/filter
                                       │   before    │                after                │
                                       │   sec/op    │   sec/op     vs base                │
    FilterMatch/tcp-not-syn-v4-8         15.43n ± 3%   15.38n ± 5%        ~ (p=0.339 n=10)
    FilterMatch/udp-existing-flow-v4-8   42.45n ± 0%   34.77n ± 1%  -18.08% (p=0.000 n=10)
    geomean                              25.59n        23.12n        -9.65%

Updates #12486

Change-Id: I595cfadcc6b7234604bed9c4dd4261e087c0d4c4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-06-17 07:38:32 -07:00
committed by Brad Fitzpatrick
parent d6a8fb20e7
commit 9e0a5cc551
6 changed files with 121 additions and 26 deletions
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2
net/packet/tsmp.go
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@@ -57,7 +57,7 @@ type TailscaleRejectedHeader struct {
const rejectFlagBitMaybeBroken = 0x1
func (rh TailscaleRejectedHeader) Flow() flowtrack.Tuple {
return flowtrack.Tuple{Proto: rh.Proto, Src: rh.Src, Dst: rh.Dst}
return flowtrack.MakeTuple(rh.Proto, rh.Src, rh.Dst)
}
func (rh TailscaleRejectedHeader) String() string {