From: Ted Ts'o <tytso@mit.edu>
To: Jacek Luczak <difrost.kernel@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>,
Hillf Danton <dhillf@gmail.com>,
linux-ext4@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-btrfs@vger.kernel.org, lczerner@redhat.com
Subject: Re: getdents - ext4 vs btrfs performance
Date: Thu, 1 Mar 2012 13:42:48 -0500 [thread overview]
Message-ID: <20120301184248.GC32588@thunk.org> (raw)
In-Reply-To: <CADDYkjRs934T2D7DPCk_dcrazptWtLu70=A61R32p22Ee1iXsw@mail.gmail.com>
On Thu, Mar 01, 2012 at 03:43:41PM +0100, Jacek Luczak wrote:
>
> Yep, ext4 is close to my wife's closet.
>
Were all of the file systems freshly laid down, or was this an aged
ext4 file system?
Also you should beware that if you have a workload which is heavy
parallel I/O, with lots of random, read/write accesses to small files,
a benchmark using tar might not be representative of what you will see
in production --- different file systems have different strengths and
weaknesses --- and the fact that ext3/ext4's readdir() returns inodes
in a non-optimal order for stat(2) or unlink(2) or file copy in the
cold cache case may not matter as much as you think in a build server.
(i.e., the directories that do need to be searched will probably be
serviced out of the dentry cache, etc.)
Regards,
- Ted
next prev parent reply other threads:[~2012-03-01 18:42 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 13:52 getdents - ext4 vs btrfs performance Jacek Luczak
2012-02-29 13:55 ` Jacek Luczak
2012-02-29 13:55 ` Jacek Luczak
2012-02-29 14:07 ` Jacek Luczak
2012-02-29 14:07 ` Jacek Luczak
2012-02-29 14:07 ` Jacek Luczak
2012-02-29 14:21 ` Jacek Luczak
2012-02-29 14:21 ` Jacek Luczak
2012-02-29 14:21 ` Jacek Luczak
2012-02-29 14:42 ` Chris Mason
2012-02-29 14:55 ` Jacek Luczak
2012-03-01 13:35 ` Jacek Luczak
2012-03-01 13:50 ` Hillf Danton
2012-03-01 14:03 ` Jacek Luczak
2012-03-01 14:18 ` Chris Mason
2012-03-01 14:43 ` Jacek Luczak
2012-03-01 14:43 ` Jacek Luczak
2012-03-01 14:51 ` Chris Mason
2012-03-01 14:51 ` Chris Mason
2012-03-01 14:51 ` Chris Mason
2012-03-01 14:57 ` Jacek Luczak
2012-03-01 14:57 ` Jacek Luczak
2012-03-01 14:57 ` Jacek Luczak
2012-03-01 18:42 ` Ted Ts'o [this message]
2012-03-02 9:51 ` Jacek Luczak
2012-03-01 4:44 ` Theodore Tso
2012-03-01 4:44 ` Theodore Tso
2012-03-01 4:44 ` Theodore Tso
2012-03-01 14:38 ` Chris Mason
2012-03-01 14:38 ` Chris Mason
2012-03-02 10:05 ` Jacek Luczak
2012-03-02 10:05 ` Jacek Luczak
2012-03-02 10:05 ` Jacek Luczak
2012-03-02 14:00 ` Chris Mason
2012-03-02 14:16 ` Jacek Luczak
2012-03-02 14:16 ` Jacek Luczak
2012-03-02 14:16 ` Jacek Luczak
2012-03-02 14:26 ` Chris Mason
2012-03-02 14:26 ` Chris Mason
2012-03-02 19:32 ` Ted Ts'o
2012-03-02 19:50 ` Chris Mason
2012-03-05 13:10 ` Jan Kara
2012-03-03 22:41 ` Jacek Luczak
2012-03-03 22:41 ` Jacek Luczak
2012-03-04 10:25 ` Jacek Luczak
2012-03-04 10:25 ` Jacek Luczak
2012-03-05 11:32 ` Jacek Luczak
2012-03-05 11:32 ` Jacek Luczak
2012-03-05 11:32 ` Jacek Luczak
2012-03-06 0:37 ` Chris Mason
2012-03-06 0:37 ` Chris Mason
2012-03-08 17:02 ` Phillip Susi
2012-03-09 11:29 ` Lukas Czerner
2012-03-09 14:34 ` Chris Mason
2012-03-10 0:09 ` Andreas Dilger
2012-03-10 4:48 ` Ted Ts'o
2012-03-11 10:30 ` Andreas Dilger
2012-03-11 16:13 ` Ted Ts'o
2012-03-15 10:42 ` Jacek Luczak
2012-03-15 10:42 ` Jacek Luczak
2012-03-15 10:42 ` Jacek Luczak
2012-03-18 20:56 ` Ted Ts'o
2012-03-13 19:05 ` Phillip Susi
2012-03-13 19:53 ` Ted Ts'o
2012-03-13 20:22 ` Phillip Susi
2012-03-13 21:33 ` Ted Ts'o
2012-03-14 2:48 ` Yongqiang Yang
2012-03-14 2:51 ` Ted Ts'o
2012-03-14 14:17 ` Zach Brown
2012-03-14 16:48 ` Ted Ts'o
2012-03-14 17:37 ` Zach Brown
2012-03-14 8:12 ` Lukas Czerner
2012-03-14 9:29 ` Yongqiang Yang
2012-03-14 9:29 ` Yongqiang Yang
2012-03-14 9:29 ` Yongqiang Yang
2012-03-14 9:38 ` Lukas Czerner
2012-03-14 12:50 ` Ted Ts'o
2012-03-14 14:34 ` Lukas Czerner
2012-03-14 17:02 ` Ted Ts'o
2012-03-14 19:17 ` Chris Mason
2012-03-14 14:28 ` Phillip Susi
2012-03-14 16:54 ` Ted Ts'o
2012-03-10 3:52 ` Ted Ts'o
2012-03-15 7:59 ` Jacek Luczak
2012-03-15 7:59 ` Jacek Luczak
2012-03-15 7:59 ` Jacek Luczak
-- strict thread matches above, loose matches on Subject: below --
2012-02-29 13:31 Jacek Luczak
2012-02-29 13:51 ` Chris Mason
2012-02-29 14:00 ` Lukas Czerner
2012-02-29 14:05 ` Chris Mason
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