I'm just in the process of migrating my keyserver to another host and during that I was trying out new config values.
Previously I had Debian's defaults pagesize: 16 ptree_pagesize: 16
now I tried with SKS' defaults. But then every time during the full build of the DB, the process just freezed. Could be killed only with SIGKILL.
Now I use. pagesize: 32 ptree_pagesize: 32 which seems to work as well.
The machine is really rather powerfull 4GB RAM, 2 core cpu... are SKS' defaults sane?