Global lock information maintained via Lamports Paxos algorithm. 8 MB presto-serve board per server. Next looks at Conectathon benchmark. Frangipani is slower on creates, setattr, and readdir, but the authors claim that these operations don't matter. Recall that one of LFS's big claims was its superior create performance.
Performance is due to logging and striping.
With lock contention, read-ahead can cause serious degradation. Potential Problems Petal and Frangipani can do redundant logging. Frangipani does no optimization placing data on disks.