修复hp / spk自动切换

hc

2023-03-15 f8c23d1415aad662de5acfa33671b5d14d2c1300

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Partial implementation of various ring layouts, useful to tune virtio design.
Uses shared memory heavily.
 
Typical use:
 
# sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring