Re: [lustre-devel] [PATCH] staging: lustre: delete the filesystem from the tree.

From: Alexey Lyashkov <alexey.lyashkov@gmail.com>
To: Andreas Dilger <adilger@dilger.ca>
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>
Subject: Re: [lustre-devel] [PATCH] staging: lustre: delete the filesystem from the tree.
Date: Mon, 4 Jun 2018 07:17:48 +0300	[thread overview]
Message-ID: <271C72E6-27C0-425F-B43F-16A37C638DCB@gmail.com> (raw)
In-Reply-To: <CF1B7A14-3C16-4CD1-8274-C6A3E0065624@dilger.ca>

> 4 июня 2018 г., в 7:15, Andreas Dilger <adilger@dilger.ca> написал(а):
> 
> On Jun 3, 2018, at 9:59 PM, Alexey Lyashkov <alexey.lyashkov@gmail.com> wrote:
>> 
>>> On Sun, Jun 03 2018, Dilger, Andreas wrote:
>>> 
>>>> 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.
>>>> 
>>>> 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
>> 
>> 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.
> 
> 
Andreas,

I talk about RXE driver in OFED stack. It have works over TCP networks.
It likely to be RoCE v2 compatible as UDP tunnel use and exist for while.

Alex