Hi, On 06.03.2013 16:27, Alexandru Florescu wrote: > > Hi, > I have a 3 server architecture, a HAproxy that sends balanced traffic > to 2 Nginx servers. > > I noticed that if I run "ab -n 1000 -c 100" directly on the Nginx > server I get response times between 40 and 80ms > If I run the same test via HAproxy I receive results between 120 and > 4000ms. And this is I get lucky as I can even wait for 30seconds to > get all the replies back from HAproxy server. > Well 120 up to 200ms would be okay, but 4000ms is not. Could you disable Firewalling, e.g. unload all neccessary modules on the HAProxy Machine?
> I've been struggling to tune the kernel params and other things for > days now but I still cannot make this work properly. > I noticed that on HAproxy server I have all the time at least 20K > TIME_WAIT connections ( netstat -a -n|grep TIME_WAIT|wc -l) > while on the Nginx servers that number is about 600 for each one. > TIME_WAITS are usually not a problem. Please look at the nice guide ( http://www.exceliance.fr/en/ART-2006-making%20applications%20scalable%20with%20LB.pdf ) > I suspect that is because of this that the service doesn't always > perform well but I would surely appreciate any advice from you. > Also, let me know what kernel params or configuration files you might > need me to share with you in order to get a better understanding. > Would you mind, share your sysctl settings? > Thank you, > Alex > > cheers thomas
