[OpenAFS] poor out of cache behavior on writing

[emoy@apple.com]

nfs             0.120u  21.030s  4:19.47  8.1%
afs 0.5G cache  0.100u 517.330s 10:49.84 79.6%
afs 2GB cache   0.060u  20.570s  4:49.58  7.1%

In these tests, I copy a 1 GB file from the client to the server.  In  
both NFS and AFS cases, I use the same client and server machines.

Notice that with the 0.5 GB cache, it takes about 2.5x longer to copy  
the file, and consumes almost 80% of the CPU, mostly in system time.   
The 2 GB cache case is more reasonable, taking just slightly longer  
than NFS.

This is OpenAFS 1.2.8; both server and client are Mac OS X.  Do others  
on other platforms see this same behavior?
------------------------------------------------------------------------ 
--
Edward Moy
Apple Computer, Inc.
emoy@apple.com

(This message is from me as a reader of this list, and not a statement
from Apple.)