[krbdev.mit.edu #372] rcache speedup via removing fsync() call

[Ken Raeburn]

Nicolas Williams <Nicolas.Williams at sun.com> writes:

> And what about adding rcache locking?  How does that affect the
> performance? :)

If we try to support multiple processes each adding multiple entries
to the replay cache, it'll undoubtedly slow things down much more in
the current design.  We probably need a new approach....