Hello, I am wanting to move to HAProxy for my load balancing solution. Over all I have been greatly impressed with it. It has way more throughput and can handle way more connections then our current LB Solution (nginx). I have been noticing one issue in all of our tests though, it seems like in the TP99.9 (and greater) of response times is much MUCH higher then nginx and we have a lot of outliers.
Our test makes a call to the VIP and times the time it takes to receive the data back then pauses for a sec or two and makes the next response. In both of the sample results below I did 2000 requests. HAProxy Average: 39.71128451818 Median: 29.4217891182 tp90: 67.48199012481 tp99: 313.29083442688 tp99.9: 562.318801879883 Over 500ms: 10 Over 2000ms: 0 nginx Average: 69.6072148084641 Median: 59.2541694641113 tp90: 87.6350402832031 tp99: 112.42142221222 tp99.9: 180.88918274272 Over 500ms: 0 Over 2000ms: 0 So as you can see a big difference in the TP99.9 and a big difference in the outlier count but the average and median response time are really low. We are running a pretty stock centos 5.6 server install with HAProxy 1.4.15, HAProxy isn't using more then like 4% of the CPU and the System CPU is closer to 12%. I was wondering if you guys had any obvious response time related performance tweaks I can try. If you need more info let me know too. Thanks, Matt C.
