From: Bruce Fields <bfields@fieldses.org>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: Bruce Fields <bfields@redhat.com>,
Anna Schumaker <schumaker.anna@gmail.com>,
Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH v4 2/5] NFSD: Add READ_PLUS data support
Date: Fri, 4 Sep 2020 12:26:16 -0400 [thread overview]
Message-ID: <20200904162616.GB2158@fieldses.org> (raw)
In-Reply-To: <A11FE08B-0AF7-42BB-9456-2D8ECC1D5B71@oracle.com>
On Fri, Sep 04, 2020 at 12:17:29PM -0400, Chuck Lever wrote:
>
>
> > On Sep 4, 2020, at 11:24 AM, Bruce Fields <bfields@fieldses.org> wrote:
> >
> > I'm not seeing the RDMA connection, by the way. SEEK and READ_PLUS
> > should work the same over TCP and RDMA.
>
> The READ_PLUS result is not DDP-eligible because there's no way for
> the client to predict in advance whether there will be data (which
> can be moved by RDMA), holes or patterns (which cannot), nor how
> many of each there might be.
>
> Therefore I've asked Anna to leave READ_PLUS disabled on RDMA mounts.
Oh, of course, makes sense.
I think we should leave ourselves the options of handling some of these
unlikely corner cases differently in the two cases, but I wouldn't
expect that to cause a noticeable difference in any normal use.
--b.
next prev parent reply other threads:[~2020-09-04 16:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 16:53 [PATCH v4 0/5] NFSD: Add support for the v4.2 READ_PLUS operation schumaker.anna
2020-08-17 16:53 ` [PATCH v4 1/5] SUNRPC/NFSD: Implement xdr_reserve_space_vec() schumaker.anna
2020-08-17 16:53 ` [PATCH v4 2/5] NFSD: Add READ_PLUS data support schumaker.anna
2020-08-28 21:25 ` J. Bruce Fields
2020-08-28 21:56 ` J. Bruce Fields
2020-08-31 18:16 ` Anna Schumaker
2020-09-01 16:49 ` J. Bruce Fields
2020-09-01 17:40 ` Anna Schumaker
2020-09-01 19:18 ` J. Bruce Fields
2020-09-04 13:52 ` J. Bruce Fields
2020-09-04 13:56 ` Chuck Lever
2020-09-04 14:03 ` Bruce Fields
2020-09-04 14:07 ` Chuck Lever
2020-09-04 14:29 ` Bruce Fields
2020-09-04 14:36 ` Chuck Lever
2020-09-04 14:49 ` J. Bruce Fields
2020-09-04 14:58 ` Chuck Lever
2020-09-04 15:24 ` Bruce Fields
2020-09-04 16:17 ` Chuck Lever
2020-09-04 16:26 ` Bruce Fields [this message]
2020-09-04 16:30 ` Chuck Lever
2020-08-17 16:53 ` [PATCH v4 3/5] NFSD: Add READ_PLUS hole segment encoding schumaker.anna
2020-08-17 16:53 ` [PATCH v4 4/5] NFSD: Return both a hole and a data segment schumaker.anna
2020-08-28 22:18 ` J. Bruce Fields
2020-08-31 18:15 ` Anna Schumaker
2020-08-17 16:53 ` [PATCH v4 5/5] NFSD: Encode a full READ_PLUS reply schumaker.anna
2020-08-19 17:07 ` [PATCH v4 0/5] NFSD: Add support for the v4.2 READ_PLUS operation Chuck Lever
2020-08-26 21:54 ` J. Bruce Fields
2020-08-31 18:33 ` Anna Schumaker
2020-09-04 15:56 ` J. Bruce Fields
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