>One possibility is to try changing rsize and wsize at the client end. Is
>the 10G network used for NFS the same network as the one used for the
>iSCSI?
>I've tried several values of rsize and wsize and it doesn't change anything.  
>iSCSI and NFS are not on the same VLAN. I'm testing with servers which are on 
>the same chassis (NFS/GFS servers are on blades and client is a KVM guest with 
>virtio network card). iSCSI and NFS use separates network in the chassis but 
>each blade has to share iSCSI (50% to 100% of 10 Gbits/s) and LAN (50% to 
>100%). 

>iperf between server and client : 3.4 Gbits/s (435 Mbytes/s).


You could also try using Jumbo Frames on the network.





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