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

[Or Gerlitz]

On Wed, Feb 26, 2014 at 12:11 AM, Jiri Kosina <jkosina@xxxxxxx> wrote:
> The problem encountered was described as follows:
>         It's not memory reclamation that is the problem as such. There is
>         an indirect dependency between network filesystems writing back
>         pages and ipoib_cm_tx_init() due to how a kworker is used. Page
>         reclaim cannot make forward progress until ipoib_cm_tx_init()
>         succeeds and it is stuck in page reclaim itself waiting for network
>         transmission. Ordinarily this sitaution may be avoided by having
>         the caller use GFP_NOFS but ipoib_cm_tx_init() does not have
>         that information.

So to hit the bug, one just needs to attempt doing NFS client mount
over an IP subnet served by IPoIB NIC that uses connected-mode and
runs over mlx4 device?  Or this happens when  the connection is going
through teardown/re-establishment or something else?
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