Hi Xuxinkun, When testing with libvirt, could you run a top, then type 1 to see CPU usage and report us the Soft Interrupts CPU usage? Same test without libvirt.
Baptiste On Sun, Dec 1, 2013 at 7:06 AM, xuxinkun <[email protected]> wrote: > hi: > I’m a coder from CHINA. Recently, I make a research on elastic cluster, > just like ELB of Amazon(http://aws.amazon.com/elasticloadbalancing). I make > use of haproxy to balance the load to the virtual machines. I’m amazing > about the performance of the haproxy. It can forward the request with just > little cost. But, with libvirt(http://libvirt.org/), haproxy cannot perform > as well as it usually do. The performance of haproxy will be reduced to one > quarter. Let me show you my environment. > In our environment, I use tomcat as a web server. When I make a get > request on url http://127.0.0.1:8080/ok.html, it just returns a “ok”. I > deploy it on a virtual machine called vm_A(192.168.13.87). Then I choose > haproxy as load balancing node. The haproxy is located on a physical > machine, called machine_B(192.168.13.6). Haproxy has only one backend and > only one frontend with port 80. The backend has only one server, vm_A. > Besides, vm_A is not in machine_B. > Then I make a performance test. The result is following: > When the test machine directly accessed > vm_A(http://192.168.13.87:8080/ok.html). It can reach about 9000 > Transactions Per Second. > When the test machine accessed haproxy > machine_B(http://192.168.13.6/ok.html). It can also reach about 8000 > Transactions Per Second. > Then I just installed the libvirt on machine_B (without changing the > conf file of haproxy) and did the test again. When accessed > http://192.168.13.6/ok.html, it can reach only about 2000 Transactions Per > Second. And when I just remove the libvirt of machine_B (without changing > the conf file of haproxy), and test again. It recovered to about 8000 > Transactions Per Second. I have done the test for server times. The result > is same. > > The following is the info about my environment. > Haproxy:v.1.4.24 > Physical Machine: Intel(R) Xeon(R) CPU E5620 @ 2.40GHz 16 Cores; 32GB > Memory;500GB Disk. > Physical Machine OS: centos 6.3 > libvirt: x86_64,v0.10.2-18.el6_4.15 > > Does haproxy have conflict with libvirt? I guess that may libvirt change > system configure. But after severl days’ work, I still cannot figure it out. > So, I write this email to you and ask for your help. > Thanks for your reading. I'm looking forward to your reply. > > > XuXinkun > > 2013-12-1 > > ------------------ > Name:XuXinkun > Email:[email protected] > Address:Hohai University NanJing JiangSu
