From: Anna Schumaker <Anna.Schumaker@netapp.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
Marc Eshel <eshel@us.ibm.com>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
<linux-nfs-owner@vger.kernel.org>, <xfs@oss.sgi.com>
Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments
Date: Wed, 25 Mar 2015 13:15:05 -0400 [thread overview]
Message-ID: <5512ED19.4060902@Netapp.com> (raw)
In-Reply-To: <20150324174916.GA28906@infradead.org>
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
>
WARNING: multiple messages have this Message-ID (diff)
From: Anna Schumaker <Anna.Schumaker@netapp.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
Marc Eshel <eshel@us.ibm.com>,
linux-nfs-owner@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments
Date: Wed, 25 Mar 2015 13:15:05 -0400 [thread overview]
Message-ID: <5512ED19.4060902@Netapp.com> (raw)
In-Reply-To: <20150324174916.GA28906@infradead.org>
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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next prev parent reply other threads:[~2015-03-25 17:15 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-16 21:18 [PATCH v3 0/3] NFSD: Add READ_PLUS support Anna Schumaker
2015-03-16 21:18 ` [PATCH v3 1/3] NFSD: nfsd4_encode_read{v}() should encode eof and maxcount Anna Schumaker
2015-03-16 21:18 ` [PATCH v3 2/3] NFSD: Add basic READ_PLUS support Anna Schumaker
2015-03-16 21:18 ` [PATCH v3 3/3] NFSD: Add support for encoding multiple segments Anna Schumaker
2015-03-17 19:56 ` J. Bruce Fields
2015-03-17 20:07 ` J. Bruce Fields
2015-03-17 21:36 ` J. Bruce Fields
2015-03-18 18:16 ` Anna Schumaker
2015-03-18 18:55 ` J. Bruce Fields
2015-03-18 20:39 ` Anna Schumaker
2015-03-18 20:55 ` J. Bruce Fields
2015-03-18 21:03 ` Anna Schumaker
2015-03-18 21:11 ` J. Bruce Fields
[not found] ` <OFB111A6D8.016B8BD5-ON88257E0D.001D174D-88257E0D.005268D6@us.ibm.com>
2015-03-19 15:36 ` J. Bruce Fields
2015-03-19 16:28 ` Marc Eshel
2015-03-20 15:17 ` J. Bruce Fields
2015-03-20 15:17 ` J. Bruce Fields
2015-03-20 16:23 ` Christoph Hellwig
2015-03-20 16:23 ` Christoph Hellwig
2015-03-20 18:26 ` J. Bruce Fields
2015-03-20 18:26 ` J. Bruce Fields
2015-03-24 12:43 ` Anna Schumaker
2015-03-24 12:43 ` Anna Schumaker
2015-03-24 17:49 ` Christoph Hellwig
2015-03-24 17:49 ` Christoph Hellwig
2015-03-25 17:15 ` Anna Schumaker [this message]
2015-03-25 17:15 ` Anna Schumaker
2015-03-26 15:21 ` Anna Schumaker
2015-03-26 15:21 ` Anna Schumaker
2015-03-26 15:32 ` Trond Myklebust
2015-03-26 15:32 ` Trond Myklebust
2015-03-26 15:36 ` Anna Schumaker
2015-03-26 15:36 ` Anna Schumaker
2015-03-26 15:38 ` J. Bruce Fields
2015-03-26 15:38 ` J. Bruce Fields
2015-03-26 15:47 ` Anna Schumaker
2015-03-26 15:47 ` Anna Schumaker
2015-03-26 16:06 ` Trond Myklebust
2015-03-26 16:06 ` Trond Myklebust
2015-03-26 16:11 ` Anna Schumaker
2015-03-26 16:11 ` Anna Schumaker
2015-03-26 16:13 ` Trond Myklebust
2015-03-26 16:13 ` Trond Myklebust
2015-03-26 16:14 ` Anna Schumaker
2015-03-26 16:14 ` Anna Schumaker
2015-03-27 19:04 ` Anna Schumaker
2015-03-27 19:04 ` Anna Schumaker
2015-03-27 20:22 ` Trond Myklebust
2015-03-27 20:22 ` Trond Myklebust
2015-03-27 20:46 ` Anna Schumaker
2015-03-27 20:46 ` Anna Schumaker
2015-03-27 20:54 ` J. Bruce Fields
2015-03-27 20:54 ` J. Bruce Fields
2015-03-27 20:55 ` Anna Schumaker
2015-03-27 20:55 ` Anna Schumaker
2015-03-27 21:08 ` J. Bruce Fields
2015-03-27 21:08 ` J. Bruce Fields
2015-04-15 19:32 ` Anna Schumaker
2015-04-15 19:32 ` Anna Schumaker
2015-04-15 19:56 ` J. Bruce Fields
2015-04-15 19:56 ` J. Bruce Fields
2015-04-15 20:00 ` J. Bruce Fields
2015-04-15 20:00 ` J. Bruce Fields
2015-04-15 22:50 ` Dave Chinner
2015-04-15 22:50 ` Dave Chinner
2015-04-17 22:07 ` J. Bruce Fields
2015-04-17 22:07 ` J. Bruce Fields
2015-04-15 22:57 ` Dave Chinner
2015-04-15 22:57 ` Dave Chinner
2015-03-26 16:11 ` J. Bruce Fields
2015-03-26 16:11 ` J. Bruce Fields
2015-03-26 16:18 ` Anna Schumaker
2015-03-26 16:18 ` Anna Schumaker
2015-03-30 14:06 ` Christoph Hellwig
2015-03-30 14:06 ` Christoph Hellwig
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