Received-SPF: pass (google.com: domain of linux-nfs+bounces-3075-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161;
Message-ID: <f49907ea-cedc-44b7-9ffc-30c265731f3e@linux.dev>
Date: Tue, 30 Apr 2024 15:58:23 +0200
Precedence: bulk
MIME-Version: 1.0
Subject: Re: [RFC PATCH 0/4] NFS: Fix another 'check_flush_dependency' splat
To: Chuck Lever III <chuck.lever@oracle.com>
Cc: Chuck Lever <cel@kernel.org>,
 Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
 "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
References: <20240429152537.212958-6-cel@kernel.org>
 <efc4f895-3a45-4b44-a47d-532896526458@linux.dev>
 <90F6A893-5315-4E53-B54E-1CF8D7D4AC4D@oracle.com>
Content-Language: en-US
From: Zhu Yanjun <yanjun.zhu@linux.dev>
In-Reply-To: <90F6A893-5315-4E53-B54E-1CF8D7D4AC4D@oracle.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit


On 30.04.24 15:42, Chuck Lever III wrote:
>
>> On Apr 30, 2024, at 3:26 AM, Zhu Yanjun <zyjzyj2000@gmail.com> wrote:
>>
>> On 29.04.24 17:25, cel@kernel.org wrote:
>>> From: Chuck Lever <chuck.lever@oracle.com>
>>> Avoid getting work queue splats in the system journal by moving
>>> client-side RPC/RDMA transport tear-down into a background process.
>>> I've done some testing of this series, now looking for review
>>> comments.
>> How to make tests with nfs && rdma? Can you provide some steps or tools?
> We are building NFS tests into kdevops:
>
>     https://github.com/linux-kdevops/kdevops.git
>
> and there is a config option to use soft iWARP instead of TCP.

Thanks a lot. It is interesting. Have you made tests with RXE instead of 
iWARP?

If yes, does nfs work well with RXE? I am just curious with nfs && RXE.

Normally nfs works with TCP. Now nfs will use RDMA instead of TCP.

The popular RDMA implementation is RoCEv2 which is based on UDP protocol.

So I am curious if NFS can work well with RXE (RoCEv2 emulation driver) 
or not.

If the user wants to use nfs in his production hosts, it is possible 
that nfs will work with RoCEv2 (UDP).

Best Regards,

Zhu Yanjun

>
> kdevops includes workflows for fstests, Mora's nfstest, the
> git regression suite, and ltp, all of which we use regularly
> to test the Linux NFS client and server implementations.
>
>
>> I am interested in nfs && rdma.
>>
>> Thanks,
>> Zhu Yanjun
>>
>>> Chuck Lever (4):
>>>    xprtrdma: Remove temp allocation of rpcrdma_rep objects
>>>    xprtrdma: Clean up synopsis of frwr_mr_unmap()
>>>    xprtrdma: Delay releasing connection hardware resources
>>>    xprtrdma: Move MRs to struct rpcrdma_ep
>>>   net/sunrpc/xprtrdma/frwr_ops.c  |  13 ++-
>>>   net/sunrpc/xprtrdma/rpc_rdma.c  |   3 +-
>>>   net/sunrpc/xprtrdma/transport.c |  20 +++-
>>>   net/sunrpc/xprtrdma/verbs.c     | 173 ++++++++++++++++----------------
>>>   net/sunrpc/xprtrdma/xprt_rdma.h |  21 ++--
>>>   5 files changed, 125 insertions(+), 105 deletions(-)
>>> base-commit: e67572cd2204894179d89bd7b984072f19313b03
> --
> Chuck Lever
>
>
-- 
Best Regards,
Yanjun.Zhu