linux-kernel - Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option

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Message-ID: <CAH2r5mtzUJUakbPr_kzrDcqVPC9QuS7K8MXejNz7F=Uii6K5Kg@mail.gmail.com>
Date:   Fri, 18 May 2018 13:44:44 -0700
From:   Steve French <smfrench@...il.com>
To:     Long Li <longli@...rosoft.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Steve French <sfrench@...ba.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option

On Fri, May 18, 2018 at 12:00 PM, Long Li via samba-technical
<samba-technical@...ts.samba.org> wrote:
>> Subject: Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option
>>
>> On Thu, May 17, 2018 at 05:22:14PM -0700, Long Li wrote:
>> > From: Long Li <longli@...rosoft.com>
>> >
>> > When cache=rdma is enabled on mount options, CIFS do not allocate
>> > internal data buffer pages for I/O, data is read/writen directly to user
>> memory via RDMA.
>>
>> I don't think this should be an option.  For direct I/O without signing or
>> encryption CIFS should always use get_user_pages, with or without RDMA.
>
> Yes this should be done for all transport. If there are no objections, I'll send patches to change this.

Would this help/change performance much?



-- 
Thanks,

Steve