Hi, The following patch uses a reader/writer lock to replace the lockmgr locks on vnodes. There are very few users of lockmgr() left and this is a step towards removing it. http://www.netbsd.org/~ad/vnlock.diff On a dual core box there is a slight boost doing make -j8 cleandir on the source tree. 42.31s real 44.03s user 23.86s system lockmgr, from cold 33.89s real 43.47s user 23.81s system lockmgr, warm 42.15s real 43.65s user 23.83s system rwlock, from cold 33.68s real 43.46s user 23.40s system rwlock, warm Comments? Thanks, Andrew