netdev - Re: [PATCH 05/14] SIWv2: User interface: siw_verbs.h, siw_verbs.c, siw_user.h, siw

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Message-ID: <OFBDD508BB.9355E78E-ONC12578B2.004F1ECC-C12578B2.004F4DED@ch.ibm.com>
Date:	Fri, 17 Jun 2011 16:26:12 +0200
From:	Bernard Metzler <BMT@...ich.ibm.com>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	linux-rdma@...r.kernel.org, linux-rdma-owner@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 05/14] SIWv2: User interface: siw_verbs.h, siw_verbs.c, siw_user.h, siw_ae.c



linux-rdma-owner@...r.kernel.org wrote on 06/17/2011 04:20:35 PM:

> On 06/17/2011 09:14 AM, Bernard Metzler wrote:
> > Steve,
> > we currently do not support inline data for kernel clients since
> > we copy those data into a malloc'd buffer, where kmalloc()
> > might block. Using an explicit buffer comes from experiments
> > to allow for larger blocks of inlined data.
> > I could put the inline data directly into the wqe restricting it
> > to some 200 bytes or less (dependent on wqe size which
> > is mainly determined by numer of sge's supported).
> > would that make sense? maybe it would better reflect the
> > intended nature of inline data - put some bytes out w/o
> > doing memory registration...
>
> I assume the intention of SEND_INLINE was precisely to allow putting
> the data into the HW WQE to avoid an additional DMA
> fetch of small payloads for HW RDMA devices.  For SWIW, this is not
> really an issue.
>
>
but we have to provide a non-blocking fast path for kernel clients,
which forces me to do the same.

Thanks,
Bernard.


> Steve.
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