SVNCacheRevProps and other performance tweaks.

Hi all,

I've just finished a dump/load cycle on about 500GB worth of repositories to bring in the more efficient changes for FSFS in 1.8 (We're on 1.8.8 now). I'm looking at utilising some performance tweaks to make the most of the hardware the server is running on. Could someone clarify a couple of the more arcane directives for me, as they're only tersely or not at all described in the docs, yet:

SVNPathAuthz - Currently 'On'. To my understanding, the value 'short_circuit' will prevent any other path-based authorisation being used for requests. I'm running Apache2.4/mod_dav_svn, with local Basic Auth and local Authz files. No network drives or other auth methods are configured for the server, which is dedicated to svn. Would short_circuit save me any processing time in this scenario or is it only useful for people with LDAP or other auth systems that might slow down request processing?

SVNCacheRevProps - Currently 'Off'. I'm told that it "should only be enabled under the conditions described in the documentation", but I can't find any reference to it in the source or the 1.8 book, yet. What are the conditions in which it should be used and what happens if I use it outside those conditions? Do I risk DB corruption or is it only of benefit in specific scenarios?

SVNInMemoryCacheSize - Just want to confirm this one: Is the overall server memory footprint (CacheSize*No. of worker processes) under mod_dav_svn? I'm using the prefork mpm (some minor PHP admin scripts on the box), and typically have 20-80 running child workers active. Bumping this up 256kb or 1MB would have a negligible effect, if this is the case.

Thanks,

Terry.
Received on 2014-05-14 20:58:46 CEST