On Thu, 2008-02-28 at 17:02 +0100, Rai wrote: > I'm running a load balancer with ipvsadm with 10 lighttpd servers. > Serving more than 6 million pages per day.
How many individual object fetches does that equate to? What are the mean, median max an min object request rates? I'm not being nosey - this could be useful info. > Sometimes i have 3 (or 9) seconds of delay load balancer is serving pages. Sounds like a TCP retransmit problem to me, indicating packet loss somewhere in the path. If I recall correctly, an unacknowledged SYN will be retransmitted 3 seconds after the first one, then there's an increasing delay such that: Packet Time 1 0 2 3 3 9 (3+6) 4 21 (9+12) 5 45 (21+24) ...and so on, until the timer elapses and the connection fails completely. > If i request a page directly to the lighttpd server, i haven't any problem. When you test, are you testing an unloaded system? By this I mean: you test a single webserver which is *not* serving any other requests; you also test a single, unloaded load balancer which has the ten machines behind it but is *not* serving any other requests at the same time. Alternatively, are you hitting in-service machines here? If you are, your packet flow through the director is (in theory at least) 10 times that of an individual web server. Somewhere you're dropping packets. You may want to make sure your director isn't overloaded or has a NIC or switchport which is reporting errors. Graeme _______________________________________________ LinuxVirtualServer.org mailing list - [email protected] Send requests to [EMAIL PROTECTED] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
