From: Mike Fedyk <mfedyk@mikefedyk.com>
To: Daniel Taylor <Daniel.Taylor@wdc.com>
Cc: Daniel J Blueman <daniel.blueman@gmail.com>,
Mat <jackdachef@gmail.com>, LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org,
Chris Mason <chris.mason@oracle.com>,
Ric Wheeler <rwheeler@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
The development of BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: Btrfs: broken file system design (was Unbound(?) internal fragmentation in Btrfs)
Date: Wed, 23 Jun 2010 21:51:12 -0700 [thread overview]
Message-ID: <AANLkTil5Gl0-rWClRsLZby_c37bQu5RB_tCgHsxTFshO@mail.gmail.com> (raw)
In-Reply-To: <469D2D911E4BF043BFC8AD32E8E30F5B24AEBA@wdscexbe07.sc.wdc.com>
On Wed, Jun 23, 2010 at 8:43 PM, Daniel Taylor <Daniel.Taylor@wdc.com> =
wrote:
> Just an FYI reminder. =C2=A0The original test (2K files) is utterly
> pathological for disk drives with 4K physical sectors, such as
> those now shipping from WD, Seagate, and others. =C2=A0Some of the
> SSDs have larger (16K0 or smaller blocks (2K). =C2=A0There is also
> the issue of btrfs over RAID (which I know is not entirely
> sensible, but which will happen).
>
> The absolute minimum allocation size for data should be the same
> as, and aligned with, the underlying disk block size. =C2=A0If that
> results in underutilization, I think that's a good thing for
> performance, compared to read-modify-write cycles to update
> partial disk blocks.
Block size =3D 4k
Btrfs packs smaller objects into the blocks in certain cases.
next prev parent reply other threads:[~2010-06-24 4:51 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 14:58 Unbound(?) internal fragmentation in Btrfs Edward Shishkin
[not found] ` <AANLkTilKw2onQkdNlZjg7WVnPu2dsNpDSvoxrO_FA2z_@mail.gmail.com>
2010-06-18 8:03 ` Christian Stroetmann
2010-06-18 13:32 ` Btrfs: broken file system design (was Unbound(?) internal fragmentation in Btrfs) Edward Shishkin
2010-06-18 13:45 ` Daniel J Blueman
2010-06-18 16:50 ` Edward Shishkin
2010-06-23 23:40 ` Jamie Lokier
2010-06-24 3:43 ` Daniel Taylor
2010-06-24 4:51 ` Mike Fedyk [this message]
2010-06-24 22:06 ` Daniel Taylor
2010-06-25 9:15 ` Btrfs: broken file system design Andi Kleen
2010-06-25 18:58 ` Btrfs: broken file system design (was Unbound(?) internal fragmentation in Btrfs) Ric Wheeler
2010-06-26 5:18 ` Michael Tokarev
2010-06-26 11:55 ` Ric Wheeler
[not found] ` <57784.2001:5c0:82dc::2.1277555665.squirrel@www.tofubar.com>
2010-06-26 13:47 ` Ric Wheeler
2010-06-24 9:50 ` David Woodhouse
2010-06-18 18:15 ` Christian Stroetmann
2010-06-18 13:47 ` Chris Mason
2010-06-18 15:05 ` Edward Shishkin
[not found] ` <4C1B8B4A.9060308@gmail.com>
2010-06-18 15:10 ` Chris Mason
2010-06-18 16:22 ` Edward Shishkin
[not found] ` <4C1B9D4F.6010008@gmail.com>
2010-06-18 18:10 ` Chris Mason
2010-06-18 15:21 ` Christian Stroetmann
2010-06-18 15:22 ` Chris Mason
2010-06-18 15:56 ` Jamie Lokier
2010-06-18 19:25 ` Christian Stroetmann
2010-06-18 19:29 ` Edward Shishkin
2010-06-18 19:35 ` Chris Mason
2010-06-18 22:04 ` Balancing leaves when walking from top to down (was Btrfs:...) Edward Shishkin
[not found] ` <4C1BED56.9010300@redhat.com>
2010-06-18 22:16 ` Ric Wheeler
2010-06-19 0:03 ` Edward Shishkin
2010-06-21 13:15 ` Chris Mason
[not found] ` <20100621180013.GD17979@think>
2010-06-22 14:12 ` Edward Shishkin
2010-06-22 14:20 ` Chris Mason
2010-06-23 13:46 ` Edward Shishkin
[not found] ` <4C221049.501@gmail.com>
2010-06-23 23:37 ` Jamie Lokier
2010-06-24 13:06 ` Chris Mason
2010-06-30 20:05 ` Edward Shishkin
[not found] ` <4C2BA381.7040808@redhat.com>
2010-06-30 21:12 ` Chris Mason
2010-07-09 4:16 ` Chris Samuel
2010-07-09 20:30 ` Chris Mason
2010-06-23 23:57 ` Btrfs: broken file system design (was Unbound(?) internal fragmentation in Btrfs) Jamie Lokier
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