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Group the HostInfo fields the packet paths touch

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Nate Brown
2026-07-23 15:25:27 -05:00
parent 30e2735af3
commit 983784bc41
1 changed files with 16 additions and 10 deletions
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hostmap.go
+16 -10
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@@ -238,18 +238,30 @@ const (
) )
type HostInfo struct { type HostInfo struct {
// The first cache line is everything the packet paths touch. Grouping them here means a send or receive
// pulls in one line instead of two, which is what the layout looked like when state lived at the end.
remote atomic.Pointer[netip.AddrPort] remote atomic.Pointer[netip.AddrPort]
remotes *RemoteList
promoteCounter atomic.Uint32
ConnectionState *ConnectionState ConnectionState *ConnectionState
remoteIndexId uint32
localIndexId uint32 // state holds everything the hot paths need to touch per packet, in one word: whether we have seen traffic
// each way since the connection manager last looked, whether it has given up on us, and the
// Interface.rebindEpoch this tunnel last sent under. Keeping the epoch here means it survives the traffic
// bits being cleared, so a tunnel that has not sent since a rebind still notices when it does.
state atomic.Uint32
promoteCounter atomic.Uint32
remoteIndexId uint32
localIndexId uint32
remotes *RemoteList
// vpnAddrs is a list of vpn addresses assigned to this host that are within our own vpn networks // vpnAddrs is a list of vpn addresses assigned to this host that are within our own vpn networks
// The host may have other vpn addresses that are outside our // The host may have other vpn addresses that are outside our
// vpn networks but were removed because they are not usable // vpn networks but were removed because they are not usable
vpnAddrs []netip.Addr vpnAddrs []netip.Addr
// Everything below is off the packet path: handshakes, relays, roaming and the connection manager.
// networks is a combination of specific vpn addresses (not prefixes!) and full unsafe networks assigned to this host. // networks is a combination of specific vpn addresses (not prefixes!) and full unsafe networks assigned to this host.
networks *bart.Table[NetworkType] networks *bart.Table[NetworkType]
relayState RelayState relayState RelayState
@@ -270,12 +282,6 @@ type HostInfo struct {
lastRoam time.Time lastRoam time.Time
lastRoamRemote netip.AddrPort lastRoamRemote netip.AddrPort
// state holds everything the hot paths need to touch per packet, in one word: whether we have seen traffic
// each way since the connection manager last looked, whether it has given up on us, and the
// Interface.rebindEpoch this tunnel last sent under. Keeping the epoch here means it survives the traffic
// bits being cleared, so a tunnel that has not sent since a rebind still notices when it does.
state atomic.Uint32
// lastUsed tracks the last time ConnectionManager checked the tunnel and it was in use. // lastUsed tracks the last time ConnectionManager checked the tunnel and it was in use.
// This value will be behind against actual tunnel utilization in the hot path. // This value will be behind against actual tunnel utilization in the hot path.
// This should only be used by the ConnectionManagers ticker routine. // This should only be used by the ConnectionManagers ticker routine.