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

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Message-ID: <CAJZOPZKYA8Pz1x1cKn46A7+EO+th4DETvmYiX_HR7aYbsfxRRw@mail.gmail.com>
Date:	Tue, 25 Feb 2014 23:52:45 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Roland Dreier <roland@...nel.org>, Amir Vadai <amirv@...lanox.com>,
	Eli Cohen <eli@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Mel Gorman <mgorman@...e.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: 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 <jkosina@...e.cz> wrote:
>>
>> This was originally a patch from Matthew Finlay <matt@...lanox.com> 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?
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