Thanks Peres, I had tried that already. serv-close actually took my sites and games down to a crawl.
I tried pretend keep-alives as well and removing httpclose all together; same result; seems best with httpclose enabled. Any other Ideas/suggestions? On another note, I notice that haproxy strips out/uncompresses any gzipping the server replies with. Could this be related? Cheers, David ________________________________ From: Peres Levente <sheri...@sheridan.hu> To: David Tosoff <dtos...@yahoo.com> Sent: Wed, February 2, 2011 3:00:16 AM Subject: Re: HAproxy Tuning - HTTP requests loading serially Hi David, Just a blind guess, but... I don't know how your app handles keepalive, but maybe try losing "option httpclose" and use "option http-server-close" instead, thus allowing proper keepalive. This gave me an immediate performance boost for a webfarm that serves literally millions of requests per minute - albeit at the cost of having to deal with about a hundred thousand unproperly-closed stale connections simultaneously on the gateways - which can be taken care of with timeout and sysctl settings. Levente 2011.02.02. 0:30 keltezéssel, David Tosoff írta: Hello All, > > >I've recently setup a pair of haproxy VMs (running in Hyper-V) over >Ubuntu 10.10 w/ keepalived > > >Things seem to be working pretty well. We're moving 35-50Mbps (1442 > >concurrent sessions avg) thru the primary node all day, but we're >noticing that multiple concurrent http requests from the client seem >like they're being responded to serially. > > >For example, we run a 3D game that issues http requests for in-world >resources (textures, maps, images) from the client to the web >servers >through HAproxy. When we log into the game, we see multiple blank >areas on the walls that load one-by-one, slowly, serially. When we >bypass HAproxy, everything will load immediately. Oddly enough, >individual request thru haproxy are very fast: 65K resource file >downloads in 0.17seconds; but the next resource doesn't load until >the >previous is complete... > > >Is there a limit of how many concurrent (http or otherwise) >connections to haproxy/linux a client can have? >Can you point me to any performance tweaks I can place in Ubuntu or >Haproxy that will help with this? > > >Thanks in advance! >David > > >[CURRENT CONFIG] > global > daemon > user haproxy > maxconn 100000 > pidfile /etc/haproxy/haproxy.pid > stats socket /tmp/haproxy.stat level admin > > > defaults > mode http > timeout connect 5000ms > timeout client 50000ms > timeout server 50000ms > retries 3 > option redispatch > option httpclose > option forwardfor > > > backend WEBFARM > balance leastconn > cookie HAP-SID insert indirect maxidle 120m > option httpchk GET /check.aspx HTTP/1.0 > http-check expect string SUCCESS > server TC-IIS-2 10.4.1.22:80 cookie TI2 check > server TC-IIS-3 10.4.1.23:80 cookie TI3 check > server TC-IIS-4 10.4.1.24:80 cookie TI4 check > server TC-IIS-5 10.4.1.25:80 cookie TI5 check > server TC-IIS-6 10.4.1.26:80 cookie TI6 check > server TC-IIS-7 10.4.1.27:80 cookie TI7 check > > > frontend HYBRID_WEBS > default_backend WEBFARM > bind 127.0.0.1:80 name LOCAL > bind 10.4.0.10:80 name HYBRID_WEBS > > >________________________________ >avast! Antivirus: Inbound message clean. >Virus Database (VPS): 110201-0, 2011.02.01 >Tested on: 2011.02.02. 0:32:27 >avast! - copyright (c) 1988-2011 AVAST Software. >
