Hi Jose, A bit off topic, but may I ask how you created that nice graph?
Bart On Thu, Jan 14, 2010 at 4:12 AM, Jose Avila(Tachu) <ta...@crowdstar.com> wrote: > I have a theory on a recent issue i've been experiencing for the last 2 days > that i would like some clarification on. > I have a load balancer with 30 backend servers with a roundrobin balance line > and a maxconn per server of 75. from my understanding is that the round > robing will go in turns one by one. once the balancer starts to queue up ej > reaches maximum of 75 requests on all servers. will the queue wait for the > next available server on the stack or will it wait for the actual server that > was next in turn ?? if so 1 slow request that takes 6 seconds would mean that > ever single request in the queue will take at least 6 seconds even if the > server response time for all those queued up requests once server would be > say 200ms causing a snowball effect of slow requests? > > Am i seeing this right? and if so would it be better to avoid this issue to > change my balance to leastconn so it takes the next avaiable one instead of > waiting for the next in the round robin?? > The issue you see at around 11:45 was me changing the max conn per server > from 75 to 300 affectively clearing the queue increaseing the avg server > response time from 1s to about 4 secons but overall dropping my total > response time to client to about 4 seconds > Here is a sample graph > >
