Also, it looks like the tweaks to worker to reduce the time spent
in mutex-protected code may have worked. In this test case, the
mutex lock/wakeup calls aren't as prominent as they used to be.
syscall seconds calls errors
read 21.22 3611 902
open 4.51 905
close 8.32 1802
brk .07 6
stat 3.96 905
lseek 5.15 903
fcntl 9.70 1815
lwp_park 2.72 1042
lwp_unpark 15.08 970
poll 5.45 900
writev 4.14 902
lwp_mutex_wakeup .46 83
lwp_mutex_lock .70 71
fstat64 11.69 1815
accept 15.08 908
shutdown 4.26 902
getsockname 3.96 908
getsockopt 11.17 1815
setsockopt 6.04 907
------- ------ ----
sys totals: 133.68 21170 902
usr time: 3.93
elapsed: 49.28
