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The FreeBSD bot had these error messages in the log files:
1) kernel: swap_pager: indefinite wait buffer: device
2) Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.p
v_entry_max sysctl.
I set up the bot from scratch with these changes:
a) Use swap partition (2GB) instead of swap file (2 GB).
b) Use these sysctls:
 kern.ipc.shm_use_phys=1
 vm.pmap.shpgperproc=4096
 vm.pmap.pv_entry_max=16777216
c) Use self-compiled Python2.7 instead of the system Python2.6.
Let's see how that works out. Error 1) is bad, perhaps FreeBSD
does not play well with the qcow2 file system under high load.