might be a similar question is that does ovs has any mechanism that can make it runs "faster" when it has more incoming flows?
On Wed, Jan 15, 2014 at 4:56 PM, Xiaoye Sun <[email protected]> wrote: > Hi all, > > I created a chain network topology with 3 ovs kernel switches. Each switch > at the end of the chain connects to a host. The topology is like this: > h1--s1--s2--s3--h2 > > These switches are connect to a pox controller running on the local > machine. > The pox controller runs a layer 2 forwarding application installing exact > matching rules, specifying mac address, ip address and TCP port. > > The experiment I did is described here. > h1 keeps sending TCP syn packet to h2 with different TCP source port > number at a specific rate. > After h2 receives the syn packet, it will immediately replies a syn-ack > packet to h1. > Each syn and syn-ack pair will be consider as different flow by the > switches since controller only install exact matching rules. > Thus, every syn and syn-ack packet will be sent to the controller by the > switches. > > In the experiment, I change the sending rate of the syn packet and compute > the RTT of each syn and syn-ack pair. However, I found that when the rate > is high, for example, 200 syn pkt per sec, the RTTs usually are much less > than the RTTs of a lower sending rate, for example 50 pkt per sec. > > This result is strange since when the sending rate is high, the controller > and ovs should have more workload. The RTT should not be less than the RTT > in a network having less workload per second... > > Does anybody know why this happens? > > > -- > Xiaoye (Steven) Sun, Ph.D. Student > Department of Electrical and Computer Engineering (ECE) & Department of > Computer Science (CS) > George R. Brown School of Engineering > Rice University, Houston, Texas, USA > -- Xiaoye (Steven) Sun, Ph.D. Student Department of Electrical and Computer Engineering (ECE) & Department of Computer Science (CS) George R. Brown School of Engineering Rice University, Houston, Texas, USA
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