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Old 05-04-2013, 12:32 PM   #1
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How to tune tcp parameters for higher transfer rate on 100Mbps

I am doing my project on live migration of virtual machine using xen and kvm.I want to increase the throughput on 100Mbps link,what parameters I need to set and how.

Old 05-04-2013, 10:43 PM   #2
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That depends on what speed you are currently getting, what error rates the network is getting AND what speed the entire network is, and how busy the network/hosts are dealing with other network traffic.

Usually, reducing the TCP window size will increase the throughput... but only if the error rate is VERY low. Otherwise what happens is that you cause MORE overhead due to retransmissions.

For a 100 Mbit link you likely won't get more than 10Mbyte/sec (if you are lucky -Both hosts have to be on the same network segment, and no other hosts can be having network activity. It could go down to 0 depending on how many hosts are also on the same network and how busy they are.

This is why it isn't easy to give an answer.


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