Hello Friends, I apologies about I am asking questions here not related OVS. I am sure I will get an answer of my question here.
Recently I am doing an experiment with my friend on KVM live migration. While doing this we encountered some network speed issue. I thought I should share this with you all and get your input on this. It will help us to move further and to do deep study. We have two servers Host 1 and 2 both installed KVM, directly attached to TP-Link TL-SG1016 16-port unmanaged Gigabyte switch Host 1 --->TP-Link Giga Switch<------ Host 2 We run the command: "tcpdump -i eth0 -w blabla.pcap" inside both Host 1 and Host 2. We are trying to migrate a VM (copy-storage-all) from Host 1 to Host 2. The network speed is around 600Mbps. We found below issues, First, it turned out that tcpdump slows down the network speed. Second, Host 1 captured 4.8G data while Host 2 captured 5.3G data. Third, just FYI, ifconfig or kernel's stats will rotate the network transferred data every 4G. We tried IPtraf, got the same issue. The source counts less than the destination. But if we switch a 100M switch, the source outgoing data will be exactly the same as the destination incoming data. Here we pretty much need to handle two issues: high speed, and support large data counts. Like migrating a 40G image, KVM will migrate at least more than 40G data over the network. How can we capture the total byte count of the data flow, that's our problem? If you could propose a better solution for this, I can try it. Also I will try with tcpstats. Thank you all in advance for your time and consideration After this I am going to try this with OVS :) Regards, Hitesh Wadekar _______________________________________________ dev mailing list [email protected] http://openvswitch.org/mailman/listinfo/dev
