- b=977: C-z (and other non-fatal signals) send us into an infinite loop if

- b=977: C-z (and other non-fatal signals) send us into an infinite loop if
         we wait for recovery.  We now use signal blocking to prevent signal
         delivery until we're interested in some or all signals.

- b=988: umount -f hangs when MDS is dead

- b=722: Lustre kernel threads cause load average to skyrocket. (Still get
         a little boost from the socknal threads, but it's much better.)