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I'm just talking about 1.5+, since before that version it's like there would be not git merge, just git cherry-pick. (You had to explicitly specify each revision. That's not merging.)
A quick howto is here.
A command which may be useful but left out is like 'git log master..branch', to see what revisions will be merged:
$ time svn mergeinfo https://swig.svn.sourceforge.net/svnroot/swig/trunk/ \ --show-revs eligible (...) real 0m14.902s user 0m0.155s sys 0m0.013s
Well, it's getting better, but as the blog post says it's still not git-like.
Actually it's horribly slow, I'm still waiting for 'svn merge https://swig.svn.sourceforge.net/svnroot/swig/trunk/' to finish. ;-)