[Zope] highly available Zope thread; our hanging problem

Hi all - I was looking at the discussion from April that was posted on the HighlyAvailableZope Wiki about problems with Zope hanging; we had a similar situation here at Digital Garage which seemed to be alleviated by changing the zombie_timeout to be really short (like, 1 minute). Before changing the zombie_timeout, the server would periodically hang and not give any responses to requests, sometimes recovering after a short time. At this point, I don't have anything more than just an empirical observation - changing this parameter seemed to help our server. Has anyone else noticed anything similar, or can explain this observation? Thanks, --Brian Hooper