Today I tried to import the whole downloaded tarball of OpenSolaris into Subversion repository. Interesting enough, it took more then 2 and a half hours to finish. Somehow I expected it [Subversion] to be more quick. On the other hand the tarball contains more then 38 thousands files and directories, so may be it is not so bad. Hard to say... I should also try it with fsfs as a repository backend. And may be it would be better if I would do it locally, instead of pushing everything over the network.
Update: I tried it locally with fsfs backend and it took 12 minutes. Quite an improvement.