Re: [PATCH] mlx4: Use GFP_NOFS calls during the ipoib TX path when creating the QP

On Fri, Feb 21, 2014 at 11:53 PM, Jiri Kosina [off-list ref] wrote:

quoted

This was originally a patch from Matthew Finlay [off-list ref] that
addressed a problem whereby NFS writes would enter uninterruptible sleep
forever.  The issue happened when using NFS over IPoIB. This is not a
recommended configuration as RDMA is preferred but it is still a valid
configuration and is important to have in situations where the NFS server
does not support RDMA. The problem encountered was described as follows:
.

And what happens if you use IPoIB datagram mode, is/why the patch is
needed there?


Also the patch uses a new QP creatiob flag IB_QP_CREATE_USE_GFP_NOFS
but it doesn't
touch include/rdma/ib_verbs.h nor I see this flag defined anywhere on
the patch, does it compile? how?