[Pvfs2-users] clients and servers communicate over what?

[xiangyong ouyang]

hi,

I'm testing pvfs2 over both InfiniBand and IPoIB.  For IB,  I started pvfs2 server with config file like ib://hostname:3335....   ForIPoIB, pvfs2 servers use config file like tcp://ipoib-address.3334..... 

Then I mounted pvfs2 file system accrodingly in clients, using either ib://hostname:3335 or tcp://ipoib-address:3334...   

After that, I run mpi-io test program on clients to measure R/W bandwidth of pvfs2. To my surprise the ipoib gives a better performance number than IB, which can't be true since ipoib involves a lot of overhead on top of IB. 

So I doubt that clients might not be talking to pvfs2 servers using IB or ipoib as I expect. I want to know what kind of communication transport a client is using (is it tcp/ip, ipoib or IB). How can I implement that task? thanks!


xiangyong ouyang