From: Andreas Dilger <adilger@sun.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Abhishek Rai <abhishekrai@google.com>,
linux-kernel@vger.kernel.org, Ken Chen <kenchen@google.com>,
Mike Waychison <mikew@google.com>
Subject: Re: [PATCH] Clustering indirect blocks in Ext3
Date: Fri, 16 Nov 2007 04:28:41 -0700 [thread overview]
Message-ID: <20071116112841.GS3966@webber.adilger.int> (raw)
In-Reply-To: <20071115230219.1fe9338c.akpm@linux-foundation.org>
On Nov 15, 2007 23:02 -0800, Andrew Morton wrote:
> So we have a section of blocks around the middle of the blockgroup which
> are used for indirect blocks.
>
> Presmably it starts around 50% of the way into the blockgroup?
>
> An important question is: how does it stand up over time? Simply laying
> files out a single time on a fresh fs is the easy case. But what happens
> if that disk has been in continuous create/delete/truncate/append usage for
> six months?
In the ext4-devel discussion, I asked about placement of the reserved
blocks. Placement at the beginning of the group showed at worst
marginally less performance and in some cases better performance.
I suspect putting the reserved blocks at the beginning of the group
would have a better long-term effect on performance because they are
not in the middle of large contiguous allocations in the middle of
the group.
Cheers, Andreas
--
Andreas Dilger
Sr. Software Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2007-11-16 11:28 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-16 5:02 [PATCH] Clustering indirect blocks in Ext3 Abhishek Rai
2007-11-16 7:02 ` Andrew Morton
2007-11-16 7:37 ` Matt Mackall
2007-11-18 15:52 ` Abhishek Rai
2007-11-18 20:47 ` Matt Mackall
2007-11-19 10:34 ` Kyungmin Park
2007-11-20 20:25 ` John Stoffel
2007-11-16 11:28 ` Andreas Dilger [this message]
2007-11-16 21:11 ` Theodore Tso
2007-11-17 0:25 ` Abhishek Rai
2007-11-17 2:58 ` Theodore Tso
2007-11-17 8:58 ` Abhishek Rai
2007-12-21 14:15 ` Abhishek Rai
2008-01-10 21:17 ` Abhishek Rai
2008-01-11 17:05 ` Daniel Phillips
2008-01-12 0:04 ` Andrew Morton
2008-01-12 6:05 ` Daniel Phillips
2008-01-13 5:06 ` Abhishek Rai
2007-11-16 22:27 ` Abhishek Rai
[not found] <9q1CT-82L-3@gated-at.bofh.it>
[not found] ` <9q3v2-2Br-3@gated-at.bofh.it>
[not found] ` <9qgLE-7ds-21@gated-at.bofh.it>
[not found] ` <9qjJx-3wE-9@gated-at.bofh.it>
[not found] ` <9qm4D-70Q-1@gated-at.bofh.it>
[not found] ` <9CQTt-7cr-27@gated-at.bofh.it>
[not found] ` <9KcYS-46E-27@gated-at.bofh.it>
2008-01-11 14:12 ` Bodo Eggert
2008-01-11 14:49 ` Abhishek Rai
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