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

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments
From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Date: Wed, 25 Mar 2015 13:15:05 -0400
Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Marc Eshel <eshel@xxxxxxxxxx>, "linux-nfs@xxxxxxxxxxxxxxx" <linux-nfs@xxxxxxxxxxxxxxx>, <linux-nfs-owner@xxxxxxxxxxxxxxx>, <xfs@xxxxxxxxxxx>
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In-reply-to: <20150324174916.GA28906@xxxxxxxxxxxxx>
References: <20150318205554.GA10716@xxxxxxxxxxxx> <5509E824.6070006@xxxxxxxxxx> <20150318211144.GB10716@xxxxxxxxxxxx> <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>
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On 03/24/2015 01:49 PM, Christoph Hellwig wrote:
> On Tue, Mar 24, 2015 at 08:43:31AM -0400, Anna Schumaker wrote:
>>> I don't know, and don't have profiles.  I'll either try to reproduce or
>>> wait till Anna's back from vacation.
>>
>> I'm using whatever functions NFSD already uses for reading files,
>> which I expect go through the VFS.  Is there a flag that controls
>> cache behavior?
> 
> There's the O_DIRECT flag, but that's not what I mean.  If you just
> wrote to it it's a cached read, if you did unmount the filesystem after
> writing, or did an echo to /proc/sys/vm/drop_caches you get uncached
> read behavior.

Oh, I'm doing uncached reads for my tests.  I'm collecting updated numbers now!

Anna
> 

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