From: Andi Kleen <andi@firstfloor.org>
To: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>,
Theodore Tso <tytso@mit.edu>,
Sunil Mushran <sunil.mushran@oracle.com>,
Amir Goldstein <amir73il@gmail.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>, Mingming Cao <cmm@us.ibm.com>,
Joel Becker <jlbec@evilplan.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-ext4@vger.kernel.org, Coly Li <colyli@gmail.com>
Subject: Re: [PATCH 08/16] ext4: Calculate and verify checksums for inode bitmaps
Date: Mon, 5 Sep 2011 20:27:27 +0200 [thread overview]
Message-ID: <20110905182727.GH7761@one.firstfloor.org> (raw)
In-Reply-To: <20110905182250.GO12086@tux1.beaverton.ibm.com>
One very interesting optimization would be to profile the metadata workload
where you got the slowdown and try to figure out which fields
were most commonly updated.
If it's some superblock fields or similar maybe those could get their separate
crcs that could be separatedly computed at much lower cost.
-Andi
next prev parent reply other threads:[~2011-09-05 18:27 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-01 0:30 [PATCH v1 00/16] ext4: Add metadata checksumming Darrick J. Wong
2011-09-01 0:30 ` [PATCH 01/16] ext4: ext4_dx_add_entry should dirty directory metadata with the directory inode Darrick J. Wong
2011-09-01 0:30 ` [PATCH 02/16] ext4: ext4_rename should dirty dir_bh with the correct directory Darrick J. Wong
2011-09-01 0:30 ` [PATCH 03/16] ext4: ext4_mkdir should dirty dir_block with the parent inode Darrick J. Wong
2011-09-01 0:30 ` [PATCH 04/16] ext4: Create a new BH_Verified flag to avoid unnecessary metadata validation Darrick J. Wong
2011-09-01 0:31 ` [PATCH 05/16] ext4: Create a rocompat flag for extended metadata checksumming Darrick J. Wong
2011-09-01 0:31 ` [PATCH 06/16] ext4: Calculate and verify inode checksums Darrick J. Wong
2011-09-01 2:30 ` Andreas Dilger
2011-09-02 19:32 ` Darrick J. Wong
2011-09-02 22:02 ` Andreas Dilger
2011-09-05 17:57 ` Darrick J. Wong
2011-09-01 0:31 ` [PATCH 07/16] ext4: Create bitmap checksum helper functions Darrick J. Wong
2011-09-01 0:31 ` [PATCH 08/16] ext4: Calculate and verify checksums for inode bitmaps Darrick J. Wong
2011-09-01 4:49 ` Andreas Dilger
2011-09-02 19:18 ` Darrick J. Wong
2011-09-02 21:27 ` Andreas Dilger
2011-09-05 18:22 ` Darrick J. Wong
2011-09-05 18:27 ` Andi Kleen [this message]
2011-09-05 19:45 ` James Bottomley
2011-09-05 22:12 ` Darrick J. Wong
2011-09-01 0:31 ` [PATCH 09/16] ext4: Calculate and verify block bitmap checksum Darrick J. Wong
[not found] ` <2492E720-3316-4561-8C9C-BBC6E8670EAD@dilger.ca>
2011-09-02 19:08 ` Darrick J. Wong
2011-09-02 21:06 ` Andreas Dilger
2011-09-01 0:31 ` [PATCH 10/16] ext4: Verify and calculate checksums for extent tree blocks Darrick J. Wong
[not found] ` <26584BE9-B716-40D5-B3B4-8C5912869648@dilger.ca>
2011-09-02 19:02 ` Darrick J. Wong
2011-09-01 0:31 ` [PATCH 11/16] ext4: Calculate and verify checksums for htree nodes Darrick J. Wong
2011-09-01 0:31 ` [PATCH 12/16] ext4: Calculate and verify checksums of directory leaf blocks Darrick J. Wong
[not found] ` <4D5D8FB2-0D8A-4D30-B6D8-51158395C1C9@dilger.ca>
2011-09-02 18:57 ` Darrick J. Wong
2011-09-02 20:52 ` Andreas Dilger
2011-09-05 18:30 ` Darrick J. Wong
2011-09-01 0:32 ` [PATCH 13/16] ext4: Calculate and verify checksums of extended attribute blocks Darrick J. Wong
[not found] ` <F4A42DCE-F91C-419B-9153-65A7EA91D241@dilger.ca>
2011-09-02 18:43 ` Darrick J. Wong
2011-09-01 0:32 ` [PATCH 14/16] ext4: Make inode checksum cover empty space Darrick J. Wong
[not found] ` <4540D5DB-53D9-4C33-BC6B-868870D42AF3@dilger.ca>
2011-09-02 18:42 ` Darrick J. Wong
2011-09-01 0:32 ` [PATCH 15/16] ext4: Calculate and verify superblock checksum Darrick J. Wong
[not found] ` <2882FBB2-797C-4D27-8569-B6826DD34F68@dilger.ca>
2011-09-02 18:40 ` Darrick J. Wong
2011-09-01 0:32 ` [PATCH 16/16] jbd2: Support CRC32C transaction checksums Darrick J. Wong
[not found] ` <99019900-30B1-450A-9620-E94371A30CC6@dilger.ca>
2011-09-02 18:31 ` Darrick J. Wong
2011-09-02 14:15 ` [PATCH v1 00/16] ext4: Add metadata checksumming Greg Freemyer
2011-09-02 18:22 ` Darrick J. Wong
2011-09-04 11:41 ` Martin K. Petersen
2011-09-04 16:54 ` Andi Kleen
2011-09-04 17:17 ` Martin K. Petersen
2011-09-04 17:44 ` Andi Kleen
2011-09-04 22:19 ` Martin K. Petersen
2011-09-05 18:55 ` Darrick J. Wong
2011-09-05 18:45 ` Darrick J. Wong
2011-09-06 12:59 ` Martin K. Petersen
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