background processes stuck in locks with ULE

Khairil Yusof khairil_yusof at
Sat Jul 19 22:48:43 PDT 2003

Trying out ULE scheduling on an SMP machine causes background processes
to be stuck in locks.

One or two processes will always get stuck in *Giant (and takes up like
60% of lock) and if these are killed, then other processes are always
taking up a total of around 10% in lock, which makes the system crawl.

Anybody else seeing this on an SMP machine with ULE scheduler?
"Optimized, readable, on time; Pick any two." 

FreeBSD 5.1-CURRENT i386 
1:08PM up 40 mins, 2 users, load averages: 1.53, 1.62, 1.33
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