In message <[EMAIL PROTECTED]>,Steve Simmons write
s:
>Inversions file system, a project which built a fs on top of  
>University Ingres. It was presented at a USENIX.  As I recall, they  
>claimed somewhere about a 2:1 overhead in general.

it depends on how this was measured.  user -> kernel -> native fs
is going to go pretty well since you dont have the extra copy
back to userspace.  user -> kernel -> userspace db is not going to
perform well due to the extra copy.  the afs fileserver wouldnt
see this same penalty.
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