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Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments

To: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 30 Mar 2015 07:06:37 -0700
Cc: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Marc Eshel <eshel@xxxxxxxxxx>, "linux-nfs@xxxxxxxxxxxxxxx" <linux-nfs@xxxxxxxxxxxxxxx>, linux-nfs-owner@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <CAHQdGtTavsJ5k0taRCBi7CgP1NYjqQmgbQcE-yUkXQOKdQsGpA@xxxxxxxxxxxxxx>
References: <OFB111A6D8.016B8BD5-ON88257E0D.001D174D-88257E0D.005268D6@xxxxxxxxxx> <20150319153627.GA20852@xxxxxxxxxxxx> <OF38D4D18B.19055EC2-ON88257E0D.0059BA03-88257E0D.005A781F@xxxxxxxxxx> <20150320151718.GD2036@xxxxxxxxxxxx> <20150320162303.GA18786@xxxxxxxxxxxxx> <20150320182621.GH2036@xxxxxxxxxxxx> <CAFX2JfkybBPcqD6A8r-jOkPnkL26=NEuK3zhA6TLn-DVam+kfQ@xxxxxxxxxxxxxx> <20150324174916.GA28906@xxxxxxxxxxxxx> <55142405.3090000@xxxxxxxxxx> <CAHQdGtTavsJ5k0taRCBi7CgP1NYjqQmgbQcE-yUkXQOKdQsGpA@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.23 (2014-03-12)
On Thu, Mar 26, 2015 at 11:32:25AM -0400, Trond Myklebust wrote:
> So there is a clear win in the 100% hole case here, but otherwise the
> statistical fluctuations are dominating the numbers. Can you get us a
> little more stats and then perhaps run the results through nfsometer?

And that's just the uncached reads if I understand the thread correctly.
The cached case isn't uncommon in real life, so regressing it isn't
really an option either.

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