From: Ted Ts'o <tytso@mit.edu>
To: Fredrick <fjohnber@zoho.com>
Cc: Ric Wheeler <rwheeler@redhat.com>,
linux-ext4@vger.kernel.org, Andreas Dilger <adilger@dilger.ca>,
wenqing.lz@taobao.com
Subject: Re: ext4_fallocate
Date: Tue, 26 Jun 2012 14:59:49 -0400 [thread overview]
Message-ID: <20120626185949.GB26669@thunk.org> (raw)
In-Reply-To: <4FE9F9F4.7010804@zoho.com>
On Tue, Jun 26, 2012 at 11:05:40AM -0700, Fredrick wrote:
>
> I had run perf stat on ext4 functions between two runs of our program
> writing data to a file for the first time and writing data to the file
> for the second time(where the extents are initialized).
>From your mballoc differences, it sounds like you were comparing
fallocate with not using fallocate at all; is that right?
The comparison you need to do is using normal fallocate versus
fallocate with the no-hide-stale feature enabled. It's obvious that
allocating blocks as you need will always be more expensive than using
fallocate.
- Ted
next prev parent reply other threads:[~2012-06-26 18:59 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 6:42 ext4_fallocate Fredrick
2012-06-25 7:33 ` ext4_fallocate Andreas Dilger
2012-06-28 15:12 ` ext4_fallocate Phillip Susi
2012-06-28 15:23 ` ext4_fallocate Eric Sandeen
2012-06-25 8:51 ` ext4_fallocate Zheng Liu
2012-06-25 19:04 ` ext4_fallocate Fredrick
2012-06-25 19:17 ` ext4_fallocate Theodore Ts'o
2012-06-26 1:23 ` ext4_fallocate Fredrick
2012-06-26 13:13 ` ext4_fallocate Ric Wheeler
2012-06-26 17:30 ` ext4_fallocate Theodore Ts'o
2012-06-26 18:06 ` ext4_fallocate Fredrick
2012-06-26 18:21 ` ext4_fallocate Ric Wheeler
2012-06-26 18:57 ` ext4_fallocate Ted Ts'o
2012-06-26 19:22 ` ext4_fallocate Ric Wheeler
2012-06-26 18:05 ` ext4_fallocate Fredrick
2012-06-26 18:59 ` Ted Ts'o [this message]
2012-06-26 19:30 ` ext4_fallocate Ric Wheeler
2012-06-26 19:57 ` ext4_fallocate Eric Sandeen
2012-06-26 20:44 ` ext4_fallocate Eric Sandeen
2012-06-27 15:14 ` ext4_fallocate Eric Sandeen
2012-06-27 19:30 ` ext4_fallocate Theodore Ts'o
2012-06-27 23:02 ` ext4_fallocate Eric Sandeen
2012-06-28 11:27 ` ext4_fallocate Ric Wheeler
2012-06-29 19:02 ` ext4_fallocate Andreas Dilger
2012-07-02 3:03 ` ext4_fallocate Zheng Liu
2012-06-28 12:48 ` ext4_fallocate Theodore Ts'o
2012-07-02 3:16 ` ext4_fallocate Zheng Liu
2012-07-02 16:33 ` ext4_fallocate Eric Sandeen
2012-07-02 17:44 ` ext4_fallocate Jan Kara
2012-07-02 17:48 ` ext4_fallocate Ric Wheeler
2012-07-03 17:41 ` ext4_fallocate Zheng Liu
2012-07-03 17:57 ` ext4_fallocate Zach Brown
2012-07-04 2:23 ` ext4_fallocate Zheng Liu
2012-07-02 18:01 ` ext4_fallocate Theodore Ts'o
2012-07-03 9:30 ` ext4_fallocate Jan Kara
2012-07-04 1:15 ` ext4_fallocate Phillip Susi
2012-07-04 2:36 ` ext4_fallocate Zheng Liu
2012-07-04 3:06 ` ext4_fallocate Phillip Susi
2012-07-04 3:48 ` ext4_fallocate Zheng Liu
2012-07-04 12:20 ` ext4_fallocate Ric Wheeler
2012-07-04 13:25 ` ext4_fallocate Zheng Liu
2012-06-26 13:06 ` ext4_fallocate Eric Sandeen
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