Hi Bar, On Sun, Apr 29, 2012 at 02:09:42PM +0300, Bar Ziony wrote: > Hi, > > I have 2 questions about a haproxy setup I configured. > > This is the setup: > LB server (haproxy 1.4.20, debian squeeze 64-bit) in http mode, forwarding > requests to a single nginx web server, that resides on a different machine. > I'll paste the haproxy config at the end of this message. > > 1. Benchmarking: > When doing some benchmarking with 'ab' or 'siege', for a small (2 bytes, > single char) file: > > ab -n 10000 -c 40 http://lb/test.html > VS > ab -n 10000 -c 40 http://web-01/test.html > > web-01 directly gets 6000-6500 requests/sec. haproxy->nginx gets 3000 > requests/sec.
This is extremely low, it's approximately what I achieve on a sub-1watt 500 MHz Geode LX, and I guess you're running on much larger hardware since you're saying it's 64-bit. > When using ab -k to enable keepalives, nginx is getting >12,000 > requests/sec, and haproxy gets around 6000-7000 requests/sec. Even this is very low. Note that the 6-7k here relates to what nginx support above without keep-alive so it might make sense, but all these numbers seem very low in general. > I wanted to ask if the x2 difference is normal? I tried to remove the ACL > for checking if the path ends with PHP, the results were not different. Is "ab" running on the same machine as haproxy ? Do you have nf_conntrack loaded on any of the systems ? Do you observe any process reaching 100% CPU somewhere ? Aren't you injecting on a 100 Mbps NIC ? > 2. As you can see, I separate the dynamic (PHP) requests from other > (static) requests. > a. Is this the way to do it (path_end .php) ? It looks fine. Other people like to store all their statics in a small set of directories and use path_beg with these prefixes instead. But it depends on how you classify your URLs in fact. > b. I limit the number of connections to the dynamic backend server(s). > I just set it according to the number of FastCGI PHP processes available on > that machine. How do I check/benchmark what is the limit for the static > backend? Or is it not needed? Nginx performs quite well in general and specially as a static file server. You may well set a high maxconn or none at all on the static backend, you won't harm it. Otherwise I found nothing suspect in your config. Regards, Willy
