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Jordan Whited 960cb50469 wgengine/wgcfg: size crypto & per-peer queues by CPU factor

To better balance throughput vs backlogged packet memory consumption.

These changes reduce peak RSS in UDP TX benchmarks that previously
regressed in 8fc6dca. All other benchmarks remain largely unchanged.
Netstack benchmarks are new, with back-tested results from 1e69418.

The following throughput and peak RSS benchmarks were performed with
iperf3 between two Intel i5-12400 nodes running Ubuntu 24.04 (Linux 6.8).

The UDP benchmarks did not use UDP GSO on the sender, so they were
roughly equivalent to single packet I/O through wireguard-go.

TCP/1 signifies one TCP stream; TCP/128 signifies 128 parallel TCP
streams. -NS signifies netstack, and -RX/-TX signify the side netstack
was running on, with the other being a natural TUN.

Change column is calculated against the oldest baseline (1e69418).

Throughput (Mb/s)
  Test            1e69418      8fc6dca  queue-size   Change
  TCP/1            10,371       11,354      11,407   +9.98%
  TCP/1-NS-TX       9,225       10,553      10,481  +13.61%
  TCP/1-NS-RX       8,573        9,097       9,002   +5.00%
  TCP/128           7,886        8,404       8,427   +6.85%
  TCP/128-NS-TX     4,613        6,408       5,448  +18.10%
  TCP/128-NS-RX     6,730        8,524       8,279  +23.02%
  UDP/1             2,111        2,853       2,751  +30.33%
  UDP/1-NS-TX       2,022        1,941       1,904   -5.85%
  UDP/1-NS-RX       2,087        2,444       2,261   +8.35%
  UDP/128           1,747        2,235       2,216  +26.87%
  UDP/128-NS-TX     1,325        1,615       1,424   +7.47%
  UDP/128-NS-RX     1,743        2,219       2,240  +28.50%

Peak memory (VmHWM, kB)
  Test           Side    1e69418      8fc6dca  queue-size   Change
  TCP/1          TX       98,240       52,596      52,508  -46.55%
                 RX      287,748       73,384      65,404  -77.27%
  TCP/1-NS-TX    TX      254,196       85,116      76,076  -70.07%
  TCP/1-NS-RX    RX      434,952       70,420      70,916  -83.70%
  TCP/128        TX      101,196       52,812      51,740  -48.87%
                 RX      290,420       63,620      62,716  -78.41%
  TCP/128-NS-TX  TX    1,499,200    1,199,304     821,740  -45.19%
  TCP/128-NS-RX  RX    3,945,960      475,276     153,516  -96.11%
  UDP/1          TX       58,864      160,840      58,060   -1.37%
                 RX      137,516       49,900      51,732  -62.38%
  UDP/1-NS-TX    TX      214,924      282,400      59,956  -72.10%
  UDP/1-NS-RX    RX      112,152       49,004      49,108  -56.21%
  UDP/128        TX       66,148      116,096      57,344  -13.31%
                 RX      154,384       56,556      57,572  -62.71%
  UDP/128-NS-TX  TX      187,096      225,080      88,628  -52.63%
  UDP/128-NS-RX  RX      156,108       74,556      75,952  -51.35%

Updates tailscale/corp#46716
Updates tailscale/corp#22467
Updates tailscale/corp#36989
Updates tailscale/corp#37878

Signed-off-by: Jordan Whited <jordan@tailscale.com>