Which branch should I run dcommit on when using git-svn?

I have just started using TortoiseGIT to work with my SVN repository at work (I have to jump between branches quite a bit so this saves on quite a bit of down time)开发者_如何学Python. However, I've only used Git or SVN, but not git-svn. Should I merge my local branch with remotes/trunk first or is just doing a dcommit from the master sufficient enough to get my changes into the trunk?

I always rebase it so there will only be fast forward movement for the trunk ref. I wonder if git-svn works correctly for merging. As I remember, git-svn, after dcommit, will perform a fetch from svn, and reset the head to position of new trunk. It gotta make your revision graph a mess, even git-svn can pick up correct revision to dcommit.