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From:   Andreas Dilger <adilger@dilger.ca>
Message-Id: <CF1B7A14-3C16-4CD1-8274-C6A3E0065624@dilger.ca>
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Subject: Re: [lustre-devel] [PATCH] staging: lustre: delete the filesystem
 from the tree.
Date:   Sun, 3 Jun 2018 22:15:31 -0600
In-Reply-To: <FE290581-D17D-4CEC-9AE2-B79DCBBD0823@gmail.com>
Cc:     NeilBrown <neilb@suse.com>,
        Andreas Dilger <andreas.dilger@intel.com>,
        "devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
        Oleg Drokin <oleg.drokin@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Christoph Hellwig <hch@infradead.org>,
        "selinux@tycho.nsa.gov" <selinux@tycho.nsa.gov>,
        fsdevel <linux-fsdevel@vger.kernel.org>,
        lustre-devel <lustre-devel@lists.lustre.org>
To:     Alexey Lyashkov <alexey.lyashkov@gmail.com>
References: <20180601091133.GA27521@kroah.com>
 <20180601114151.GA25225@infradead.org>
 <E5BF8501-35EB-4DDF-ADBE-6016CF31A502@dilger.ca>
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 <58123CDD-8424-4E1D-A11F-0F899970A49B@intel.com>
 <87h8mjp5o0.fsf@notabene.neil.brown.name>
 <FE290581-D17D-4CEC-9AE2-B79DCBBD0823@gmail.com>
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On Jun 3, 2018, at 9:59 PM, Alexey Lyashkov <alexey.lyashkov@gmail.com> =
wrote:
>=20
>> On Sun, Jun 03 2018, Dilger, Andreas wrote:
>>=20
>>> LNet is originally based on a high-performance networking stack =
called
>>> Portals (v3, http://www.cs.sandia.gov/Portals/), with additions for =
LNet
>>> routing to allow cross-network bridging.
>>>=20
>>> A critical part of LNet is that it is for RDMA and not packet-based
>>> messages.  Everything in Lustre is structured around RDMA.  Of =
course,
>>> RDMA is not possible with TCP
>=20
> To be clear. Soft IB (aka Soft RoCE) driver is part of OFED stack from =
4.8
> (or 4.9).  So RDMA API now is possible with TCP networks.

Well, strictly speaking RoCE still isn't possible with TCP networks.  =
RoCE v1
is an Ethernet layer protocol (not IP based), while RoCE v2 is UDP/IP =
based.

Cheers, Andreas


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