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

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Message-Id: <271C72E6-27C0-425F-B43F-16A37C638DCB@gmail.com>
Date:   Mon, 4 Jun 2018 07:17:48 +0300
From:   Alexey Lyashkov <alexey.lyashkov@...il.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     NeilBrown <neilb@...e.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        "selinux@...ho.nsa.gov" <selinux@...ho.nsa.gov>,
        fsdevel <linux-fsdevel@...r.kernel.org>,
        lustre-devel <lustre-devel@...ts.lustre.org>
Subject: Re: [lustre-devel] [PATCH] staging: lustre: delete the filesystem
 from the tree.


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