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From:   "Dorian Taylor (Lists)" <lists@doriantaylor.com>
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Subject: strange activity on otherwise idle linux client
Message-Id: <439CFB33-94AC-4F60-B737-A0F596B815E3@doriantaylor.com>
Date:   Sun, 16 Jan 2022 08:35:38 -0500
To:     Linux NFS Mailing List <linux-nfs@vger.kernel.org>
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Hello,

I noticed yesterday that my Linux (Ubuntu 21.10 x86_64, kernel 5.13.0) =
NFS4 mount was causing load on the (also Ubuntu, 20.04 LTS) server and =
when I went to investigate, it seemed like the client was polling the =
server at about 200 operations per second (100 ops read and the other =
100 `nfsiostat` didn=E2=80=99t specify). When I looked at `nfsstat` on =
the server, I saw a profusion of `putfh` (32%), `sequence` (30%), =
`layoutget` (15%), and `layoutreturn` (15%) (`getattr` and `lookup` took =
another 3% between them, and the rest fell below the 1%  threshold, even =
though the total number of operations recorded was on the order of 100 =
million for a day or so of uptime with two clients connected).

The chatty client was had a couple files open in Emacs but I closed them =
and determined that they weren=E2=80=99t being accessed with `lost`, but =
the polling continued. The strangely round number of the polling rate is =
suspicious. Is this normal behaviour?

It looks like the NFS version on the client is 1.3.4-6ubuntu1 and server =
is 1.3.4-2.5ubuntu3.4.

Regards,

--
Dorian Taylor
Make things. Make sense.
https://doriantaylor.com


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