> It is *safe* to configure tcp_keepalive_time to [let's say] 5 minutes, even
> there's some SQL tasks that will take 30 minutes to complete (than making
> the *server* process unresponsiviness for those 30 min) -- the client
> [connection] won't be droped since client still responds to keep alive
> probes while waiting fb server response.

As far as I understand, keepalive packets are handled by OS TCP/IP
stack transparently for application (such as FB server and client). So,
yes, it is safe because does not require any response action from FB.

SY, SD.