[openib-general] NFS-RDMA Performance Issue

[James Lentini]

On Wed, 10 Jan 2007, vishal wrote:

> Hi,
> 
>     I am getting an average speed of ~100 MiB/s using NFS-RDMA over
> Infiniband, writing to an md device. The local write speed was ~800
> MiB/s. The kernel being used is 2.6.18.3. The tests were performed using
> dd (various block sizes have been tried). I have fiddled with the rsize
> and wsize as well, but that didn't make any difference. Can anyone
> please help me out!
> 
> Thanks!
> 
> Vishal
> 
> P.S This is using NFS v3

You should use direct I/O. You will have to use a different tool, 
iozone, etc.