For certain uses 2.1.x will act pretty much like 2.0.x. Acting as a router
is one of them - the problems tend to show up only when forking and when
handling big NFS packets (and 2.0.x actually has the same problem when it
comes to NFS, so I guess the only case is forking).
There's a separate issue that we use more memory for caching, and that can
result in different kinds of performance problems on small-memory
machines, but that tends to happen only with more filesystem activity
going on (ie again a router won't ever really see that difference).
Linus
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