At my company we are using SVN 1.6.4 (server) and a variety of clients (SmartSVN, Tortoise, command-line).
At first we wanted to keep things simple and just always do merges at the root level (e.g., in c:\branch run "svn merge -c 12345 https://host/svn/trunk"). Unfortunately, merging was taking a considerable amount of time (up to several minutes), so we started doing merges at lower subdirectory levels (e.g., in c:\branch\subdir1\subdir2 running "svn merge -c 12345 https://host/svn/trunk/subdir1/subdir2). Unfortunately now the svn:mergeinfo properties have started showing up all over the place. That's not a problem in itself, but when we do a merge it updates every subdir / subfile that has a svn:mergeinfo property. Personally I think SVN ought to update only subdirs that are related to the change (e.g., ancestors of changed files). Not only would that keep the svn:megeinfo from propagating all over, but it would speed up merges. Is this something that is on the horizon to be fixed, or am I missing something? I'm not subscribed to the list, so please CC me on any response. Thanks, Phillip